Arizona Diamondbacks starting pitcher Zac Gallen (hamstring) exited Thursday's start against the hosting New York Mets in the first inning due to a strained right hamstring. After throwing his sixth pitch of the game, Gallen walked off the field before recording a single out. It needs to be noted that Gallen dealt with tightness in the same hamstring back in late April, so a stint on the injured list may very well be incoming here if the D-backs want to proceed with caution with their ace. The 28-year-old right-hander has been rock-solid in Arizona's rotation when healthy, posting a 3.12 ERA, 1.14 WHIP, and 60:15 K:BB over 57 2/3 frames (11 starts) this year. Gallen tentatively lines up next for Tuesday's start at home against the division-rival San Francisco Giants, but it's likely that either Logan Allen will rejoin the rotation or Slade Cecconi will be recalled from the minor leagues if Gallen needs to head to the IL.

Atlanta Braves starting pitching prospect Hurston Waldrep has tallied at least seven strikeouts in each of his past three starts. Through his other six outings this season, he never surpassed five punchouts. Besides his increase in strikeouts, after opening the season with ten earned runs in his first two starts, he has given up just six earned runs in his previous seven starts. Through this stretch, he has posted an incredible 1.28 ERA, 1.16 WHIP, and 12:41 BB:K ratio. Waldrep has logged 59 total innings at the Double-A level the past two seasons and will be moved up to Triple-A fairly soon. The Florida product is projected to reach the majors this summer and is worth stashing in dynasty leagues.

Houston Astros manager Joe Espada said on Wednesday that both starting pitchers Cristian Javier (forearm) and Jose Urquidy (forearm) are "getting opinions from other doctors." Espada said earlier this week that both pitchers were examined by doctors on Monday, but their imaging results haven't been disclosed. Javier was unable to throw a scheduled bullpen session on Sunday due to right forearm discomfort, and he was then placed on the injured list for the second time this season. Urquidy, on the other hand, has missed the entire season with a right forearm strain and was close to rejoining Houston's rotation before suffering a setback during a minor-league rehab assignment. This could lead to a pretty significant development for the two hurlers, who both currently have no clear timetable for a return to the Astros. Although Urquidy isn't a must-stash fantasy player, we'd recommend holding onto Javier until more is known.

Pittsburgh Pirates shortstop prospect Mitch Jebb launched a home run on Wednesday to break out of his 20-game power slump. The former second-round selection has struggled through his first look against High-A pitching. Through 38 games this season, the number seven prospect in the Pittsburgh system has posted a .197/.261/.303 line with four home runs, 18 RBI, nine stolen bases, and a 13:44 BB:K ratio. Last season, with Single-A Bradenton, he held a much better .297/.382/.398 line through 34 games. Jebb is projected to reach the majors in 2026 and should be left on the waiver wire in dynasty leagues for the foreseeable future.

Both Boston Red Sox manager Alex Cora and outfielder Tyler O'Neill (knee) are optimistic that his stint on the injured list will be on the shorter end. O'Neill is nursing inflammation in his right knee after an MRI on Wednesday showed no structural damage, and he's eligible to return from the 10-day IL as soon as Wednesday's game against the visiting Atlanta Braves. The speedy 28-year-old slugger was hitless in his last 15 at-bats before hitting the shelf, and nine of his 11 home runs on the campaign for the Red Sox came back in April. O'Neill is also hitting a mere .159 (13-for-82) with two homers, six RBI, and 10 runs scored over his last 22 games, but he's still a fine stash in fantasy for his upside in the power department and everyday role in Boston's outfield when healthy.