RADIO
Dan's top hitter streamers and starts as fantasy baseball waiver wire adds for the remainder of Week 21 of 2025 (August 18 - August 24). He analyzes streamers with favorable matchups, schedules.
The season might be winding down, but our coverage of fantasy baseball remains among the best in the industry! I've been recommending hitters to stream off the wire all season long, and I'm not about to stop now, when it matters the most!
Our hitter streamers fantasy baseball waiver wire pickups column will identify hitters with favorable matchups who can be considered waiver wire streamers ahead of the Sunday night waiver wire runs for leagues with weekly transactions. Players who appear in this article will always be rostered in 40 percent or fewer leagues on Yahoo!
In this piece, every week, I'll look to find hitters playing in the most games and who have the most favorable matchups to help you plug those gaps and fill those holes in your roster. You can also check out the rest of our fantasy baseball streamer content here at RotoBaller. Let's see which hitters we should consider grabbing off the wire as we roll into Week 21 of the fantasy baseball season!
Be sure to check all of our fantasy baseball lineup tools and resources:- Fantasy baseball trade analyzer
- BvP matchups data (Batter vs. Pitcher)
- PvB matchups data (Pitcher vs. Batter)
- Who should I start? Fantasy baseball comparisons
- Daily MLB starting lineups
- Fantasy baseball closer depth charts
- Fantasy Baseball live scoreboard
- Fantasy baseball injury reports
What Teams Offer the Most Streaming Value for Week 21?
While most MLB teams are playing six games this week, the Tampa Bay Rays play just five times.
Nine teams play seven games.
Seven-Game Weeks
CHI, COL, HOU, KCR, LAD, MIL, SDP, SFG, and TEX.
Ballpark Upgrades:
- LAD (four games at COL)
- LAA (six games at home)
Week 21 Fantasy Baseball Hitter Streamers
I'll recommend only players who are 40 percent rostered or lower, and all roster percentages are from Yahoo!
Blaze Alexander, 2B/3B/SS - ARI (29% rostered)
Alexander has had a chance to play on an everyday basis since Eugenio Suarez departed for Seattle at the deadline. He's more of a middle infielder by trade, but he's making the most of his late-season audition right now with four home runs, seven runs scored, and nine RBI over the last two weeks.
Miguel Andujar, 3B/OF - CIN (28% rostered)
The journeyman Andujar has been one of the best acquisitions of the trade deadline so far as he's been on fire since joining the Reds and quickly worked his way into the cleanup spot.
Andujar has clubbed three homers in the last week and has multiple hits in three straight games. We haven't seen this type of consistent production from Andujar since he was the everyday third baseman for the Yankees in 2018.
Grand slam for Miguel Andujar as he continues to rake since joining the Reds! pic.twitter.com/abPURQBZVi
— Talkin’ Baseball (@TalkinBaseball_) August 14, 2025
You have to keep riding the hot bat here. He's on a playoff contender and plays his home games in an elite hitters' park. He's one of my favorite pick-ups this week, along with his teammate (the guy we talk about next).
Noelvi Marte, 3B/OF - CIN (26%)
I will continue to advocate for Marte just about every week until he's more widely rostered. I suppose managers keep dropping him when he goes a few games without a hit, but I have been holding him in several leagues as this week it paid off as he was awesome, producing two HR, 8 RBI, and 5 runs while collecting at least one hit in every game.
Another fantastic swing by Noelvi Marte in the 11th tonight.
It’s so awesome to see him hitting well again.
Huge part of the future. pic.twitter.com/e95Ew1F1Kp
— Reds Daily (@RedsDaily4) August 17, 2025
Marte is a true 5-category player and simply shouldn't be available in this many leagues with what he's done on a per-game basis this season!
Ryan Mountcastle, 1B - BAL (25% rostered)
After a very long layoff, the Orioles' first baseman is back in the lineup and has been boon to the Baltimore offense, providing another right-handed power bat. Mounty has played eight games since coming off the IL, hitting safely in six of those games with two home runs and even stole a pair of bases last week against Seattle.
He was stuck in a platoon with Ryan O'Hearn at the beginning of the season, but with O'Hearn now in San Diego and the Orioles with nothing left to play for this year, we should see him in the lineup every day. If you need some power in your lineup, Mounty has the potential to finish the season strong and rack up some long balls.
Luis Rengifo, 2B/3B - LAA (18% rostered)
Rengifo has been flirting with being rosterable in standard leagues now for about a month, but a recent surge in production has firmly placed him in consideration for me. The Angels infielder is hitting .333 over the last two weeks with two home runs and eight runs scored.
He offers some pop from a middle infield position (2B) while also hitting for average and picking up the occasional stolen base. Let's see if he can keep this hot streak going for another week.
Jake Cronenworth, 1B/2B - SDP (16% rostered)
I think I have said this before, but Cronenworth is one of the most boring fantasy players on the planet. Yet, you could do far worse than "Jake the Rake" as he's hitting .316 over the last two weeks and has been an RBI machine with 11 runs batted in during that stretch.
He doesn't provide the power of a traditional first baseman, but he can still provide run production, and his second-base eligibility is clutch.
Joey Ortiz, 3B/SS - MIL (16% rostered)
I am going to come out and say what everyone is already thinking. What kind of voodoo magic do the Brewers have, and how can they keep getting huge results in the second half from players that we had all but written off earlier in the year?
Joey Ortiz is the perfect example of this. He was a popular sleeper pick for drafts, but couldn't hit anything for months and was purely a defensive asset. Now, all of a sudden, he's hitting everything and cannot be stopped.
It might be time to talk about Joey Ortiz pic.twitter.com/ZWfQJhajFa
— Jack (@YelichWasRobbed) August 14, 2025
Ortiz is batting .364 over the last two weeks with 11 runs scored, nine RBI, and two stolen bases. That's good enough to sneak into the top 40 on Yahoo's player rater. Go get him if you need help in the infield, he's been playing at an incredibly high level now for almost a month.
Daulton Varsho, OF - TOR (15% rostered)
Varsho has been a home run machine when healthy and in the lineup this season.
Daulton Varsho hits a home run every 10 at-bats this season.
INSANE. pic.twitter.com/Wt6PZC370K
— BlueJays Muse (@TORBlueJaysMuse) August 16, 2025
He's on an incredible run right now, slugging five dingers in the last two weeks while driving in 14 runs and scoring another nine runs. He's hitting .382 over that stretch and has brought his season-long average up to a respectable .249.
The Jays should feast on some Pirates pitching this week, though they will get Paul Skenes in one of those games. If you are hunting for home runs, then Varsho is simply the best add off the wire, hands down.
Week 21 Deeper League Fantasy Baseball Hitter Streamers to Consider
Some widely available hitters (under 10 percent rostered) could be worth a look this week.
- Gavin Lux, 2B/3B/OF - CIN (9% rostered)
- Tyler Freeman, 2B/SS/OF - COL (9% rostered)
- Evan Carter, OF - TEX (8% rostered)
- Trevor Larnach, OF- MIN (6% rostered)
- Wenceel Perez, OF - DET (4% rostered)
- Tyler Locklear, 1B - ARI (4% rostered)
- Colby Thomas, OF - ATH (3% rostered)
Good luck this week, and choose those streaming options wisely! Thanks for making RotoBaller your one-stop shop for all things fantasy baseball!
More Fantasy Baseball Analysis
Download Our Free News & Alerts Mobile App
Like what you see? Download our updated fantasy baseball app for iPhone and Android with 24x7 player news, injury alerts, sleepers, prospects & more. All free!
