Boston Red Sox first baseman Triston Casas (knee) has been diagnosed with a ruptured left patellar tendon. Casas was placed on the 10-day injured list earlier on Saturday but is expected to miss the remainder of the 2025 season. He was removed from Friday's contest and had to be taken off the field on a stretcher. For the time being, fantasy managers should expect Romy Gonzalez to see most of the opportunities at first base with Rafael Devers and Connor Wong also being in the mix. Casas had a slow start to the season, holding a .182/.277/.303 slash line with three doubles and three home runs across 29 games. Casas' injury could also eventually open a path for top prospects Roman Anthony or Marcelo Mayer to join the MLB roster as well.

Arizona Diamondbacks starting pitcher Merrill Kelly is still dealing with cramping issues. The right-hander was removed from Friday's start due to cramping in his right hamstring. Kelly has dealt with this issue for several seasons. After the game, the 36-year-old said, "We've tried all kinds of things. We've done all kinds of labs, all kinds of hydration stuff. If I had a good answer for you guys, I'd stop cramping." Fantasy managers should continue to monitor his status over the next few days in case the team decides to push his next scheduled start back. Through his first 37 2/3 innings of work this season, Kelly has posted a 4.06 ERA with a strong 1.06 WHIP. He has struck out just 27 batters. If he were to miss time, Ryne Nelson could be moved to the rotation, as he is currently deployed as a long relief option out of the bullpen.

The St. Louis Cardinals are promoting right-handed pitching prospect Michael McGreevy to the major leagues. In a corresponding move, the Cardinals are sending right-handed pitcher Roddery Munoz to Triple-A Memphis. McGreevy made his MLB debut last summer and performed well during his first taste, holding a strong 1.96 ERA with a 0.78 WHIP across 23 innings of work. Across this stint, he struck out 18 batters and posted a near-perfect 2.3 percent walk rate. He also generated groundballs at a 64.6 percent rate. Earlier this season at Triple-A, McGreevy has held a 4.08 ERA with a 1.29 WHIP across 28 2/3 innings at the Triple-A level. Fantasy managers should expect McGreevy to likely see time in the bullpen, but he could eventually earn a spot start if he continues to pitch well.

The San Diego Padres are promoting catcher Luis Campusano to the major leagues. In a corresponding move, the Padres are optioning infielder/outfielder Connor Joe to Triple-A El Paso. Campusano has spent the first month of the season with Triple-A. The backstop has performed quite well, posting a strong .322/.445/.598 slash line with four doubles, one triple, and six home runs across 25 contests. Last season, Campusano struggled in the major leagues as he posted an underwhelming .227/.281/.361 slash line with eight home runs and a 41:20 K:BB across 91 contests. Under the hood, he generated a .289 xwOBA. Fantasy managers should expect Campusano to share the starting job behind the crease alongside Elias Diaz and Martin Maldonado. As a result, he should only be targeted in deeper two-catcher formats.

Boston Red Sox designated hitter Rafael Devers is expected to remain at DH even with Triston Casas (knee) expected to miss the remainder of the 2025 campaign. Devers was shifted to a full-time role at the DH spot in spring training when the Red Sox signed third baseman Alex Bregman. However, manager Alex Cora was "very adamant" that Devers is the team's DH, according to Gabrielle Star of The Boston Herald. Through the first 34 games of the regular season, Devers has struggled at times, posting a .242/.365/.445 slash line with five home runs. However, under the hood, Devers has generated an elite .401 xwOBA, which suggests he should see positive regression. With Devers staying at DH, fantasy managers should expect Romy Gonzalez, Connor Wong, and Abraham Toro to see most of the starts at first base.