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

Lost password? [X]

Receive free daily analysis:


Already have an account? Log in here.


Forgot Password


Buy or Sell - Undervalued and Overvalued Players for Week 7

We are just over a month into the fantasy baseball season and it is a prime time to buy in on players whose production could be legit/should be better or hop off a heater before the floors caves in. As we all should know, baseball is a game of ebbs and flows. When there is too much good, expect some bad, and vice-versa.

The phrase Buy or Sell is a bit looser than it typically would be mid-season or closer to fantasy playoff time. The players covered, for the most part, are guys I am either wary of or tentatively interested in. We are walking a fine line here after the first month. Various factors play into good/bad season starts such as tough schedules with rough ballpark (or vice-versa), nagging injuries, poor team performance, and even the weather.

Do not be afraid to send out low-ball "feeler" offers to your league-mates this time of year for underperforming guys. You never know what they will take. Of course, the expectation should be that the offer is declined, but at least a potential conversation could begin. Have secondary players you are willing to throw in the deal, but also know your limits. If your mate if asking for a "stud" in return, make sure you try and upgrade elsewhere to mitigate the hit on your end. Good trades win you leagues, do not forget that. You always want to be as ahead of the curve as possible, and I am here to help with that. Let's take a look at what we've seen thus far.

Editor's Note: Get any full-season MLB Premium Pass for 50% off. Exclusive access to our Draft Kit, premium rankings, projections, player outlooks, top prospects, dynasty rankings, 15 in-season lineup tools, and over 200 days of expert DFS research. Sign Up Now!


Undervalued Players - Week 7

These players could be worth trying to add or acquire as long as you're not paying for preseason value. Ideally, they are just lying around on your wire and you can add them straight up or for a few extra FAAB dollars.


Rafael Devers - (3B, BOS)

79% owned

Rafi is so good but for some reason, his counting stats have been lacking this season. His batting average is up from last year and he is walking more and striking out less. The progress has been wonderful for the former top Red Sox' prospect who had some trouble making quality contact last season. Devers is still just 22 and has plenty of room to grow. He made significant strides in his conditioning over the offseason which may be leading to his current performance.

Although he is batting in the back half of the order, Devers has been productive and should be more-so as the year goes on. The Boston lineup is stacked with talent and Devers has more than enough juice in his bat to drive in much more than the 20 batters he has thus far. He should be owned in all leagues and is worth trading for even with his value jumping this past week.


Nomar Mazara - (OF, TEX)

66% owned

Nomar Mazara is underperforming like crazy. There is a massive discrepancy between his expected batting and slugging averages. He has cut his strikeouts down and managed to accrue a decent chunk of counting stats with a poor average. Mazara's BABIP is much lower than his career average while his hitting tendencies haven't changed too drastically (a few more fly balls than ground balls this year). He is hitting the ball hard more often than ever and has no competition for playing time.

Mazara is a prime buy candidate who could end the year as a .275 hitter with 30 home runs and nearly 100 RBI. His walk rate makes me uneasy for OBP leagues but those in OPS/AVG formats should be running to make offers for this Rangers' outfielder.


Lucas Giolito (SP, CWS)

27% owned

This former top pitching prospect may finally be coming into his own. Giolito's ERA is still above four but his strikeout rate is ELITE at nearly 30 percent. His xFIP and SIERA are both below four (good signs) and he has been decent against some solid competition like the Yankees and Red Sox. The outing that has tanked his numbers a bit was an early season outing against a red-hot Seattle team which could be chalked up as flukey.

Giolito has elite "stuff" and if he is putting it all together with improved velocity, you want to be along for the ride in most formats. Giolito's fastball was terrible last season but rates out as just about average now. His secondaries have been reliable and although his curveball has not been too effective yet, when it is, watch out. Giolito is worth the stream against Toronto today if he's still available just as a taste test. If he goes out and proves himself, keep him around for that next start. If not, no skin off your bones, just drop him and watch him for a bit (in shallower leagues).


Overvalued Players - Week 7

Overvalued does not always mean SELL. Players here are just showing enough red flags that warrant the overvalued tag.


Derek Dietrich - (1B/2B/OF, CIN )

37% owned

Dietrich has been on fire for the past two weeks, and I do not expect that to carry on throughout this season. Why? Mostly because he's Derek Dietrich and this is just a case of luck. No one in baseball has been luckier than Derek Dietrich. One-third of his fly balls have turned into home runs. His fly ball rate is up and so are his pull/hard-hit rates. He is selling out for power and it has worked out so far.

Going from Marlins Park to Great American Ballpark will benefit every hitter ever. GAB is a bandbox but even it cannot sustain DD's power outburst. Good news for owners is that he is walking more and striking out less. The sub-.200 BABIP will go up but should be lower than his career average due to this change in approach. If some schmuck in your league needs middle infield depth, trade Dietrich for any possible positive return.


David Peralta - (OF, ARI)

87% owned

Peralta is overperforming and absolutely a sell candidate. All of his expected stats on BaseballSavant point towards regression. His BABIP is nearly .400 while he is striking out more than ever and walking less than he has the past two years. The lineup in Arizona is not good and his counting stats should hit a rough patch in the near future.

Thus far, with 23 runs, 26 RBI and six home runs, Peralta should be decently attractive enough to include in a trade. Try to package him for maybe someone like Goldschmidt who has been underperforming or someone like Altuve who should not be on the injured list too long.

More 2019 Fantasy Baseball Advice

More Recent Articles


ADP Cost Analysis – Robbie Ray vs Trevor Bauer

With fantasy baseball draft season in full swing, those of us who partake in this joyous game are now looking through as much draft data as possible in a bid to find players we love who have lower average draft positions (ADP) than we believe they should. All this to eke out as much draft... Read More

2020 Keeper Value Rankings - Second Base

Keeper Value Rankings are intended for Keeper Leagues in which a fantasy owner must forfeit a designated draft pick in order to keep a player into the upcoming season. These rankings are based on Keeper "Values". In the marketing world, Value can be defined as "the extent to which a good or service (player) is... Read More

2020 Fantasy Baseball Sleepers – C.J. Cron

As another fantasy baseball season approaches, we once again have the chance to discuss C.J. Cron as a fantasy sleeper. Cron will be playing for his third team in three seasons. It is tough to wrap one's head around the idea that a player of Cron's talent continues to be undervalued by professional and fantasy... Read More

2020 Starting Pitcher Rankings - H2H Points Leagues

Points leagues may seem like a slight variation from traditional 5x5 category scoring leagues but you must approach draft day with a very different strategy if you wish to truly compete. All preseason long, RotoBaller has you covered with the latest rankings for all fantasy baseball league types. Here we present our points league rankings... Read More

Second-Half Improvements: Buy Into These Starting Pitchers

The second half of the season is always put under a microscope for starting pitchers. Fantasy players have a love for the second half of the season, as the belief is that pitchers who take a step forward could carry over that success the next season and perhaps even build upon it. But, as we... Read More

How to Attack RP in SV+HLD Leagues

No position has seen as much evolution in recent seasons as the relief pitcher. Gone are the days where starters were expected to go seven innings as most teams have embraced the idea of "super-bullpening" and try to fit as many pitchers that can throw 95+ MPH into their bullpen as they can. Many fantasy... Read More

Using Sabermetrics for Fantasy Baseball: Pitch Info

One of the most fundamental questions in fantasy sports is if a player's current performance is sustainable. More than any other sport, baseball has a slew of statistical measures that can be dissected in numerous ways to analyze player performance. Pitch Info is a publicly-available pitch tracking system that provides a lot of different data to... Read More

2020 Fantasy Baseball Staff Rankings

Below you will find RotoBaller's 2020 fantasy baseball rankings, tiers and auction dollar values for the 2020 MLB season. Our Ranking Wizard displays our staff's rankings for various league formats, all in one easy place. Here's what you'll find: Mixed, Head-to-Head, Points, AL/NL Only, Two-Catcher Top 2020 prospects, Dynasty leagues, Keeper values Export the rankings easily... Read More

Mock Draft Review: Best Late-Round Targets

Last week, some members of the RotoBaller staff completed a 12-team mock draft for standard 5x5 format. After the draft, we each broke down our strategy and some of our favorite picks, which can be found here. However, I want to take a closer look at one portion of the draft in particular. Since we know that... Read More

Faster and Furious: Pitchers with Rising Velocity/Performance

Welcome fantasy baseball players! I’m sure that you, like me, are anxiously counting down the days until your drafts and Opening Day. While the fantasy season may not start for several weeks, there are plenty of things we can do to start preparing for a successful season. One of those things is to take a good... Read More

James Karinchak Is A Relief Pitcher To Know in 2020

One of the lesser-known players that intrigues me for the 2020 MLB season is Indians relief pitcher James Karinchak. The former Bryant Bulldog was drafted by Cleveland in the ninth round in the 2017 draft and went on to have one of the most outrageous statistical seasons in minor league baseball history. As someone who... Read More

2020 Relief Pitcher Rankings - H2H Points Leagues

Often regarded as an inferior fantasy baseball format, points leagues offer a different style of boasting over your friends or coworkers similar to that of fantasy football. These setups are typically head-to-head formats for a one-week stretch where the player with the most points gets a win. Easy right? While it's true that roster construction... Read More

2019 Barrel Breakouts: Who's For Real and Who's Next?

As pitchers and catchers get even closer to reporting and most fantasy leagues prepare for their drafts, everybody is looking for a leg up on the competition - a way to get in on a guy before everybody else does. In this article, we're going to look for a way to identify hitters who improved... Read More

Using Sabermetrics for Fantasy Baseball: Pitcher BABIP

While FIP is a useful tool to predict a pitcher's future ERA performance, fantasy owners should remember that ERA, not FIP, is what really matters in most formats. This means that we are interested in the "luck" that separates the two statistics. While some of this luck is unpredictable, we can and should predict some... Read More

Second Year Player Preview: Fantasy Baseball 2020 ADP Analysis

Host Anthony Aniano of RotoBaller Radio discuss the 2020 fantasy baseball season and keeps you updated with all the latest news and analysis Be sure to tune into RotoBaller Radio on SiriusXM (channel Sirius 210, XM 87) - every weekday morning between 6-7 AM ET, every weekday afternoon from 1-2 PM ET, Saturday nights from 9-11 PM ET... Read More