Arizona Diamondbacks outfielder Alek Thomas (hamstring) felt more discomfort in his left hamstring and is headed back to Phoenix to be re-evaluated, according to manager Torey Lovullo. Thomas was on a minor-league rehab assignment and was expected to rejoin the big-league club on Tuesday in Cincinnati, but that won't be the case now. The 24-year-old first injured his hamstring on March 31 and had only played in four rehab games with Triple-A Reno. There's a chance he'll now have to restart a rehab assignment. As long as Thomas continues to sit out, Corbin Carroll should handle center field in Arizona, with Jake McCarthy and Randal Grichuk seeing more time in the outfield as well. Thomas is a defense-first player, so he can remain on waiver wires in mixed fantasy leagues.

The Arizona Diamondbacks officially reinstated closer Paul Sewald (oblique) from the 15-day injured list on Tuesday and optioned right-hander Scott McGough to Triple-A Reno in a corresponding move. Sewald has returned from his oblique strain and should immediately return to closing duties for the Diamondbacks out of the bullpen, although he could see some extra days off as he gets eased back into the fold. In his absence, Kevin Ginkel had five saves in his 14 appearances, but he'll now go back into more of a setup role in front of Sewald. Sewald will be making his 2024 debut for the Snakes when he gets into a game after posting a career-high 34 saves with the D-backs and Seattle Mariners in 2023. Thirteen of his 34 saves came during the regular season with Arizona.

Arizona Diamondbacks catcher Gabriel Moreno is not in the starting lineup on Tuesday against the Cincinnati Reds. Tucker Barnhart will do the catching for right-hander Zac Gallen and will hit eighth against Reds right-hander Frankie Montas. It's the second straight game that Moreno will take a seat on the bench in favor of Barnhart. The D-backs are just trying to give the young catcher some extra rest early in the season. The 24-year-old should be back in there on Wednesday. Through his first 87 at-bats of the year, he's hitting .241/.340/.322 with no home runs and 14 RBI. Barnhart is hitting .750 in four career at-bats against Montas but will be a low-upside play in DFS at the bottom of Arizona's lineup.

Arizona Diamondbacks outfielder Corbin Carroll has returned to the leadoff spot for the Diamondbacks on Tuesday against the Cincinnati Reds and right-hander Frankie Montas, who is making his first start since returning from the injured list. The 23-year-old also continues to start in center field for Arizona. It's the first time since April 22 that Carroll has higher than seventh in the batting order. The Snakes moved last year's National League Rookie of the Year down in the lineup after his early season struggles in 2024. Since April 22, Carroll has gone just 7-for-40 (.175) with just one extra-base hit (a double) and two RBI, but perhaps his move back to the top of the order will get him going again. It will certainly make the former 16th overall pick more attractive in all fantasy formats with more chances for at-bats.

In a flurry of roster moves by the Cincinnati Reds on Tuesday, right-hander Ian Gibaut (forearm) was transferred to the 60-day injured list. The Reds also optioned infielder/outfielder Nick Martini and outfielder Bubba Thompson to Triple-A Louisville and Double-A Chattanooga, respectively, and selected the contract of outfielder Conner Capel from Louisville. Gibaut is dealing with a lingering strained right forearm after he was initially shut down from throwing in late April. The 30-year-old now won't be eligible to come off the IL until late May, and even that seems optimistic with the way his recovery has gone this year. Gibaut was a key pitcher for the Reds in 2023, going 8-4 with a 3.33 ERA, a 1.28 WHIP, three saves and a career-high 69 strikeouts in 75 2/3 frames in 74 relief appearances.