Lost password?

Don't have an account?
Join the Best Live Fantasy Chat Community!


Receive free daily analysis


Already have an account? Log In


Forgot Password


Articles & Tools
Import Your Leagues
Draft Rankings
Draft Simulator
Enter League Settings
Player Comparisons
Rookies & Call-Ups
24x7 News and Alerts

Seattle Mariners: Top 10 Dynasty Prospects

fantasy baseball prospects MLB prospects rookies call-ups

The Seattle Mariners will be our next stop on the farm to evaluate the best prospects on each MLB team. Once the 2020 MLB season begins, it may turn out that Minor League systems will be more important than usual. Franchises are losing money during the pandemic layoff, so many teams will be looking for sources of cheap production. It might also take older players longer to rebound from a long layoff meaning we could see more injuries and more roster moves. We might even see expanded rosters, at least in the early going.

One important question to ask is: How will a long layoff affect prospects? One has to assume the more advanced prospects prior to the work stoppage will be at an advantage, while the more “toolsy but raw” type could be hurt with the lack of repetition and in-game action; throwing or hitting in simulated environments just doesn’t match up to the real thing. Many prospects will have to work jobs during the pandemic just to make ends meet, while players who signed for large bonuses will have an advantage. Other prospects that lack strong discipline and commitment to their craft could struggle to stay in shape.

We won’t really know what the layoff impact will have on baseball in general until things start ramping up. But we do know that a strong prospect pool will continue to be an important element for a successful baseball franchise. We're looking at the Top 10 (or more) dynasty prospects in each organization with an eye to discovering which organizations are best positioned to succeed with their player development when games resume. Make sure to check out all of our prospect content, including Top 50 for 2020 and Top 250 for Dynasty Leagues.

Editor's Note: Our incredible team of writers received 13 award nominations by the Fantasy Sports Writers Association including Baseball Writer of the Year, Football Writers of the Year, Golf Writer of the Year and many more! Be sure to follow their analysis, rankings and advice all year long, and win big with RotoBaller! Read More!


Quick Synopsis

The Mariners system has a nice combination of impact prospects and depth. The system also has intriguing prospects littered throughout from top to bottom.

1. Jarred Kelenic, OF

Dynasty Prospect Rank: 5
2020 LEVEL: AA
MLB ETA: 2021

Kelenic has quickly developed into one of the best prospects in the game and reached Double-A in 2019 as a 20-year-old. He should be a multi-tool player in the Majors with the ability to hit for average, power, and steal bases. He’s also shown a willingness to take a walk and could eventually become a beast in on-base leagues, too.

2. Julio Rodriguez, OF

Dynasty Prospect Rank: 11
2020 LEVEL: A+
MLB ETA: 2022

Early last year, I pointed to Rodriguez as a potential breakout prospect for 2019 and he was on the way to doing just that when he was slowed by injury. Just 19, he reached High-A ball while showing an advanced hitting ability. At 6-foot-4, 225 pounds, he should eventually tap into his raw power and produce 20-30 home runs. He's still only scratching the surface of his potential.

3. Logan Gilbert, RHP

Dynasty Prospect Rank: 55
2020 LEVEL: AA
MLB ETA: 2021

A top 2018 pick, Gilbert had an excellent first full pro season in 2019 by pitching at three levels and reaching Double-A. Overall, he struck out 165 batters in 135 innings. He has above-average control and a chance for four above-average offerings. There is at least No. 3 starter potential here.

4. Noelvi Marte, SS

Dynasty Prospect Rank: 69
2020 LEVEL: Rookie
MLB ETA: 2023

Marte dominated the Dominican Summer League as a 17-year-old last year. He should eventually hit for above-average power and has a chance to hit for average, too, although he has some swing-and-miss to his game that could improve with further experience.

5. George Kirby, RHP

Dynasty Prospect Rank: 72
2020 LEVEL: A+
MLB ETA: 2022

Like Logan Gilbert in 2018, I felt the Mariners got a steal in 2019 with an underrated college arm in Kirby. This right-hander has plus-plus control (25-0 K-BB rate in 23 innings during his pro debut) which helps his low-to-mid-90s fastball play up. He has four pitches and a chance for three of those to develop into above-average offerings.

6. Justin Dunn, LHP

Dynasty Prospect Rank: 92
MLB ETA: 2020

I’m perhaps a bit lower on Dunn than some. He has two above-average offerings and solid control but his below-average command keeps him from dominating as much as he should. A long layoff like this won’t help him improve in that area. For now, he looks like more of a No. 4 starter but there is further ceiling here if he can make the adjustments.

7. Kyle Lewis, OF

Dynasty Prospect Rank: 94
2020 Prospect Rank: 22
MLB ETA: 2020

Considered one of the top college hitters in the 2016 draft, Lewis has been slow to develop due to injury issues and massive swing-and-miss concerns. Those latter concerns remain but his power output exploded once he reached the juiced ball in the Majors with six home runs in 18 games (He skipped over Triple-A). If he can continue to show 30-40 home run pop in this environment, the 180+ strikeouts won’t matter.

8. Evan White, 1B

Dynasty Prospect Rank: 103
2020 Prospect Rank: 27
MLB ETA: 2020

The Mariners went all-in on White in 2019 by providing him a multi-year, multi-million dollar contract even though he has yet to play more than four games above Double-A. A former top college hitter, he’s continued to be an above-average hitter in pro ball despite an overly-aggressive approach at times. He did a better job of hitting for power in 2019 after tweaking his approach and swing to hit more fly balls.

9. Justus Sheffield, RHP

Dynasty Prospect Rank: 111
2020 Prospect Rank: 46
MLB ETA: 2020

Like Justin Dunn above, Sheffield doesn’t dominate as much as he should considering his stuff because he lacks consistent command. He also has less control than his fellow pitcher. He shows three pitches with the potential to be average or better so there is hope he can start but Sheffield might be better off in the bullpen where his lack of consistent command and control could have less of an impact.

10. Jake Fraley, OF

Dynasty Prospect Rank: 197
MLB ETA: 2020

Fraley doesn’t have a huge ceiling but he could hit well enough to be an everyday outfielder on a good baseball club. He could stand to be a little more patient but he’s shown the ability to threaten for a 20-20 (HR-SB) season if he continues to have the benefit of the juiced balls.

More Prospect Analysis


Articles & Tools
Import Your Leagues
Draft Rankings
Draft Simulator
Enter League Settings
Player Comparisons
Rookies & Call-Ups
24x7 News and Alerts


Brett Wisely8 mins ago

Optioned To Sacramento
Alex Bowman8 mins ago

Points Leader Alex Bowman Will Start From 1st At Richmond on Sunday
Chase Briscoe19 mins ago

A Strong Sleeper Option At Richmond
Joey Bart20 mins ago

Won't Play On Saturday
Austin Dillon25 mins ago

Needs A Strong Run At Richmond This Weekend
Mychal Givens27 mins ago

To Throw Next Week
Michael McDowell29 mins ago

Could Surprise At Richmond Despite Poor Track Record
Martin Truex Jr34 mins ago

. Seeking First Top 5 of the Season at Richmond
Chris Buescher35 mins ago

A Sleeper At Richmond This Weekend
Aric Almirola38 mins ago

Looking To Give Season A Boost At One Of His Best Tracks
Mitch Haniger51 mins ago

To Be Re-Evaluated Next Weekend
Logan Webb1 hour ago

Next Start Moved Up
Darrynton Evans2 hours ago

Signs With The Colts
Alex Lyon2 hours ago

Gets The Nod Saturday
Luis Severino2 hours ago

Started Throwing On Friday
Rachaad White2 hours ago

Projected To Be A Three-Down Back
Jake Oettinger2 hours ago

Confirmed Starter Against Colorado
Sean Murphy2 hours ago

Getting The Day Off On Saturday
Brock Purdy2 hours ago

Rehab Going Well For Brock Purdy
Alex Stalock2 hours ago

Tends Twine Saturday Against Devils
Starling Marte2 hours ago

Taking A Seat On Saturday
Whit Merrifield2 hours ago

Not In The Lineup On Saturday
Ivan Prosvetov2 hours ago

Set To Start Against San Jose
Luis Urías2 hours ago

Luis Urias To Miss Six To Eight Weeks
Marc-Andre Fleury2 hours ago

Protects The Crease Versus Vegas
Lars Nootbaar3 hours ago

Absent From Lineup On Saturday
Matthew Liberatore4 hours ago

Throws Five Scoreless Innings For Memphis
Joey Wiemer4 hours ago

Hitting Ninth In MLB Debut
Patrick Wisdom4 hours ago

Nick Madrigal In, Patrick Wisdom Out Saturday
Donovan Mitchell4 hours ago

Goes For 40-Plus Points Again
Julio Rodríguez4 hours ago

Julio Rodriguez Hits Two Doubles In Loss Friday
Lars Nootbaar4 hours ago

On The Bench Saturday
Jalen Brunson4 hours ago

Has A Career Night With 48 Points
Garrett Whitlock4 hours ago

Gives Up A Run In Rehab Outing
Joey Votto5 hours ago

Heads Out On Rehab Assignment
Mikal Bridges5 hours ago

Drops 42 Points On Atlanta
Michael Massey5 hours ago

Not Playing Saturday
Talen Horton-Tucker5 hours ago

Has Another Productive Outing
Willson Contreras5 hours ago

Out Saturday
Juan Soto5 hours ago

Not Focused On Contract Situation
Paolo Banchero5 hours ago

Shines Against Washington
Shai Gilgeous-Alexander5 hours ago

Piles Up 39 Points Friday
Anthony Davis5 hours ago

Battles Through Injury For A Big Double-Double
Jonathan Toews5 hours ago

Returns To Action Saturday
Tyler Toffoli5 hours ago

Nets Two Goals Against Vancouver
Clayton Keller6 hours ago

Keeps Point Streak Going Friday
Jason Robertson6 hours ago

Sets New Stars Scoring Record
Adam Fox6 hours ago

Continues Hot Spell With A Goal
Casey Mittelstadt6 hours ago

Hands Out Two Assists
Tee Higgins15 hours ago

Not Concerned About Contract Situation
Jeff Skinner15 hours ago

Scores Game-Winning Goal In Overtime
Devon Levi15 hours ago

Earns Victory In NHL Debut
Seattle Seahawks19 hours ago

Ryan Neal Becomes Free Agent
Pharaoh Brown20 hours ago

Joins Colts
Darrynton Evans20 hours ago

To Meet With Colts
Laquon Treadwell20 hours ago

Working Out For Cowboys
Zach Collins20 hours ago

Out Against Golden State
De'Andre Hunter20 hours ago

Out With A Knee Injury On Friday
Obi Toppin20 hours ago

Will Start Against The Cavs
Jarrett Allen20 hours ago

Downgraded To Out On Friday
Portland Trail Blazers23 hours ago

LaMarcus Aldridge Officially Retires From The NBA
Jamal Murray24 hours ago

Considered Questionable Against Phoenix
Nikola Jokic24 hours ago

Could Miss His Second Consecutive Game
Kenyon Martin24 hours ago

Jr. Uncertain To Play Against Detroit
Tobias Harris24 hours ago

Could Miss Friday's Game Against Toronto
Shai Gilgeous-Alexander24 hours ago

Upgraded To Questionable On Friday
Al Horford1 day ago

Uncertain To Suit Up On Friday
Jaylen Brown1 day ago

Tagged As Questionable With Lower-Back Pain
Jayson Tatum1 day ago

Listed As Questionable Against Utah
Kelly Olynyk1 day ago

Is Available Against Boston On Friday
Trayveon Williams1 day ago

Bengals Have High Hopes For Trayveon Williams
Joe Burrow1 day ago

Bengals Begin Extension Discussions With Joe Burrow
Mac Jones1 day ago

Bill Belichick Still Non-Committal On Mac Jones
Sammy Blais1 day ago

Extends Point Streak To Six Games
Cam Talbot1 day ago

Makes A Winning Return
Matthew Beniers1 day ago

Logs Two Points Against Anaheim
Stuart Skinner1 day ago

Grabs A 43-Save Shutout
Tristan Jarry1 day ago

Records His Second Shutout
Matthew Tkachuk1 day ago

Rolls To Four Points Versus Montreal
T.J. Oshie1 day ago

Exits With An Upper-Body Injury
Mikey Anderson1 day ago

Injured On First Shift Thursday
Baltimore Ravens2 days ago

Ravens Have Been Active In Receiver Market
Baker Mayfield2 days ago

Kyle Trask To Compete In Training Camp
Courtland Sutton2 days ago

Broncos Could Still Trade Jerry Jeudy, Courtland Sutton
DeAndre Hopkins2 days ago

To Stay With Cardinals?
Odell Beckham Jr.2 days ago

Jets The Most Likely Landing Spot For Odell Beckham Jr.
Carolina Panthers2 days ago

Panthers Not Settled On One QB For No. 1 Pick
Lamar Jackson2 days ago

Not Seeking Fully Guaranteed Deal
Nathan Peterman2 days ago

Re-Signs With Bears
Dre Miller2 days ago

Kendre Miller Ahead Of Schedule
Buffalo Bills2 days ago

Bills Re-Sign Jordan Phillips
Brendon Todd3 days ago

Has Success At TPC San Antonio
Ben Martin3 days ago

Has Value At TPC San Antonio
Nick Taylor3 days ago

A Boom-Or-Bust Option At Valero
Taylor Pendrith3 days ago

A Sleeper Option At TPC San Antonio
Chris Kirk3 days ago

A Good Option At The Valero Texas Open
Matt Kuchar3 days ago

Loves Playing TPC San Antonio
Will Gordon3 days ago

Offers A Wild-Card Option At Valero
Cam Davis3 days ago

Can Keep His Current Form At TPC San Antonio
Mark Hubbard4 days ago

A Low-Risk Value Option At Valero
Tyler Duncan4 days ago

Start Tyler Duncan At TPC San Antonio
Emiliano Grillo4 days ago

Not Recommended At Valero
Patrick Rodgers4 days ago

Don't Give Patrick Rodgers A Shot At Valero
Adam Schenk4 days ago

Wants To Keep Momentum Rolling At Valero
Ryan Moore4 days ago

Cannot Get Past The Cut Lately
Stephan Jaeger4 days ago

Could Warm Things Up At Valero
Si Woo Kim4 days ago

A Possible Contender At Valero
Taylor Montgomery4 days ago

Attempting To Find Weekend Consistency
Corey Conners4 days ago

Trying To Recreate A Little Magic
Thomas Detry4 days ago

Continues To Impress In Rookie Season
Aaron Rai4 days ago

Brings Positive Momentum To Valero Texas Open
Akshay Bhatia4 days ago

Looks To Stay Hot In Texas
Todd Gilliland5 days ago

Impressive At COTA
Ty Gibbs5 days ago

Finds His Footing At COTA
Chris Buescher5 days ago

Continues To Shine On Road Courses
NASCAR5 days ago

Ricky Stenhouse Jr. Finishes Seventh
Austin Cindric5 days ago

Has A Solid Day
Marlon Vera5 days ago

Has Four-Fight Winning Streak Snapped
Cory Sandhagen5 days ago

Dominates Striking Department
Yana Santos5 days ago

Dominated In Decision Loss
Holly Holm5 days ago

Dominates In Co-Main Event
Austin Lingo5 days ago

Suffers Submission Loss
Nate Landwehr5 days ago

Shines With Second-Round Submission Win
Andrea Lee5 days ago

Suffers Defeat In Close Matchup Saturday
Maycee Barber5 days ago

Takes Close Matchup On Saturday
Chidi Njokuani5 days ago

Takes Close Loss In Split-Decision Showing
Albert Duraev5 days ago

Holds Off Opponent In Tight Split Decision
William Byron5 days ago

Rounds Out Top Five At COTA
Ross Chastain5 days ago

Caught Up To Fourth At COTA On Sunday
Alex Bowman5 days ago

Brings Home Third Place Finish At COTA
Kyle Busch5 days ago

Scrambles Up To Second At Austin
Tyler Reddick5 days ago

Dominates And Wins At COTA