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Three top fantasy baseball prospects - Kristian Campbell, Carson Benge, Brandon Sproat - that can make big impacts. These MLB prospects are waiver wire pickups or stashes.
Stashing the right prospect can provide a significant boost to your fantasy team. Last season, any manager who stashed Junior Caminero was rewarded with some decent power production late in the season.
In this piece, we will look at three prospects who are currently performing at a high level at Triple-A and knocking on the MLB door.
Should those players be left on the waiver wire, or should fantasy managers add them before their breakout? Let's dive in!
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Kristian Campbell, INF/OF, Boston Red Sox
Current Level: AAA
Availability: 15% rostered
2025 AAA Stats: 50 G, .272/.388/.424, 8 2B, 6 HR, 3 SB, 58 SO, 28 BB
Are the Red Sox going to have David Hamilton play a majority of the time at second base the rest of the season? I can't imagine that will be the case. Romy Gonzalez and Nate Eaton will probably get a good amount of playing time as well, but I don't know why they haven't brought Kristian Campbell back to the majors.
Campbell isn't the best defensive second baseman, but his bat should be somewhere in the Red Sox's current and future plans. The Red Sox need to take a page out of the Cubs' playbook with how they handled Matt Shaw. They sent him down, let him get his confidence up a bit, and now he's back up in the majors and playing well.
Campbell hasn't set the world on fire at Triple-A, but he's playing pretty well and should be making his way back to Boston soon. He has a 121 wRC+ with six HRs in Triple-A over the last two months.
The shine has assuredly dimmed a bit on Campbell, but he was on a meteoric rise last season into May of this season. He came into the season as one of the best prospects in baseball after having a 178 wRC+ across three levels, and he had a 149 wRC+ in the majors this season through April. Campbell still has the potential to be the hitter we saw last season. If he gets the call back to Boston, we've seen what impact he can make in a small sample.
Kristian Campbell has turned a curve over the last month (22 games). Elite swing decisions and contact skills have fueled a 182 wRC+ and 1.056 OPS, though the batted-ball authority needs to stabilize.
Even so, he’s making a promotion feel increasingly inevitable! pic.twitter.com/GBzXFxS7Pj
— Pat (@PatSullivan05) August 15, 2025
-Written by Kevin Luo
Carson Benge, OF, New York Mets
Current Level: AAA
Availability: 5% rostered
2025 MiLB Stats: 96 G, .306/.413/.504, 24 2B, 12 HR, 20 SB, 76 SO, 61 BB
Another outfield prospect that made a massive leap in my August prospect rankings was Carson Benge of the New York Mets, who was recently promoted from Double-A to Triple-A. Benge has excelled and gotten on base at an elite clip at every level he's been at so far in his minor league career.
After debuting in Low-A with a .420 OBP in 15 games after the draft last season, Benge slashed .302/.417/.480 in 60 High-A games and then .317/.407/.571 in 32 Double-A games. Overall, Benge is slashing .308/.413/.513 in 92 games this season with 24 doubles, six triples, 12 home runs, and 19 steals in 23 attempts.
Carson Benge (@Mets No. 4 prospect) is on another planet 🤯
Benge -- @MLBPipeline's No. 68 prospect -- plates three on a bases-clearing double and has recorded 23 RBIs in 28 games at Double-A
🎠 x #NeedForSteed x @MetsPlayerDev pic.twitter.com/rDVNzzUTGZ
— Binghamton Rumble Ponies (@RumblePoniesBB) August 7, 2025
As you can probably expect with the consistently high AVG and OBP, Benge's blend of contact and approach isn't matched or exceeded by many prospects in baseball today. Benge has posted an 80% contact rate this season and has never been below a 79% contact rate at any level. He also has an impressive 7.9% SwStr rate, 14.2% walk rate, and a 17.5% strikeout rate this season, and while Benge isn't a masher or a burner, there's average to above-average raw power and above-average speed here.
When you put all of those tools together, Benge's all-around offensive profile gives him a higher floor than most, with solid five-category upside long-term. He's now in my Top-25 overall, and we could see him debut with the Mets by the end of the season.
- Written by Eric Cross
Brandon Sproat, SP, New York Mets
Current Level: AAA
Availability: 15% rostered
2025 AAA Stats:110 1/3 IP, 4.24 ERA, 1.23 WHIP, 100 SO, 49 BB
After a massive ascent up prospect rankings in 2024, as Sproat was one of the biggest pitching prospect breakouts in the game, 2025 has been rough, at least until recently. Sproat turned the corner in late June due to some pitch mix changes, and the results have followed. Sure, there was a five-run outing last week, but since June 28, Sproat has a 2.05 ERA across 48.1 innings with 57 strikeouts to 17 walks.
Brandon Sproat has been dealing over his last nine starts for Triple-A Syracuse 🔥 pic.twitter.com/Dl3cIedqsZ
— SNY Mets (@SNY_Mets) August 20, 2025
There have been some changes in the profile that led to the jump. Sproat has seen an uptick in velocity and a pitch mix change. Sproat has also moved a few inches toward the first base side of the rubber. Little changes can make all the difference.
Over that span of the last nine starts, Sproat has sat at 97.3 mph on his fastball, which is up from 95.8 previously. The whiff rate has jumped to 32 percent, an impressive number for a fastball. The curveball usage has also increased, and Sproat is sequencing much better than we previously saw. The changeup is sitting at a 41 percent whiff rate and showing strong traits to play off the sinker.
Sproat is equally mixing his slider and sweeper, and both are missing bats at strong rates. A few changes have gone a long way for Sproat. At this point, we are looking at 140 Triple-A innings for Sproat. Yes, Nolan McLean got the call first, but I have a hard time not seeing Sproat get a shot in the Mets rotation soon.
-Written by Chris Clegg
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