Seymour is slated to start Monday's game against the Guardians in Cleveland, Marc Topkin of the Tampa Bay Times reports.

At least for one turn through the rotation, Seymour will take over the starting role that was vacated by Joe Boyle, who was optioned to Triple-A Durham on Friday. Since being called up from Triple-A on July 31, Seymour has made five relief appearances, but he covered 3.1 innings Aug. 15 in San Francisco and three frames in his most recent appearance Tuesday against the Yankees, so he should be reasonably stretched out ahead of his first MLB start. The 26-year-old lefty had previously been serving as a full-time member of the rotation at Durham, producing a 2.62 ERA, 1.14 WHIP and 104:20 K:BB in 86 innings.

The Cardinals optioned Veneziano to Triple-A Memphis on Sunday.

Veneziano will cede his spot in the St. Louis bullpen to John King (oblique), who was activated from the 15-day injured list. After being called up from Memphis last Sunday, Veneziano made two relief appearances for the Cardinals and gave up two earned runs on three hits and one walk over four innings.

The Cardinals activated King (oblique) from the 15-day injured list Sunday.

St. Louis optioned reliever Anthony Veneziano to Triple-A Memphis to clear room in the bullpen for King, who had been shelved since July 30 due to a left oblique strain. Prior to going down with the injury, King had notched two wins and two holds while delivering a 5.18 ERA, 1.63 WHIP and 24:13 K:BB across 41.2 innings in 43 appearances.

Lucchesi threw a scoreless inning in Saturday's 7-1 win over the Brewers, allowing one hit.

Lucchesi entered the game in the seventh, giving up a single and throwing seven of his 12 pitches for strikes. The 32-year-old has appeared in nine games this month, recording a 9.39 ERA, 2.22 WHIP and a 4:4 K:BB in 7.2 innings. Overall, he owns a 3.96 ERA, 1.24 WHIP and a 21:6 K:BB across 25 innings in 25 games.

The Twins designated Ramirez for assignment Sunday.

Since Ramirez doesn't have minor-league options, the Twins had to move him off the 40-man roster to make room for right-hander Taj Bradley, who was called up from Triple-A St. Paul to start Sunday's game against the White Sox. After being summoned to the majors Aug. 1, Ramirez made nine relief appearances and submitted a 2.45 ERA, 1.09 WHIP and 5:2 K:BB in 11 innings. He could attract interest via waivers from teams looking to add another multi-inning option to the bullpen.

Colorado transferred Darnell (hip) to the 60-day IL on Sunday.

The Rockies placed Darnell on the 15-day IL on Friday due to left hip inflammation, an injury that interim manager Warren Schaeffer acknowledged that the reliever had been dealing with "for a while," per MLB.com. While the Rockies haven't revealed that Darnell is dealing with anything more significant than swelling in the hip, the club evidently determined that the right-hander wasn't on track to return before the end of the season. Darnell will close his rookie campaign with a 3.86 ERA, 1.46 WHIP and 5:7 K:BB in 11.2 innings out of the Colorado bullpen.

The Rockies optioned Gilbreath to Triple-A Albuquerque on Sunday.

Gilbreath's stay with the big club lasted just two days, with the reliever making his lone appearance in Friday's 9-0 loss to Pittsburgh. He'll cede his spot on the 26-man active roster to right-hander McCade Brown, who was called up from Double-A Hartford to start Sunday's series finale versus the Pirates.

Holton tossed 1.1 scoreless innings of relief to earn a hold in Saturday's 4-2 win over the Royals. He allowed a hit and struck out one.

Following five innings from starter Chris Paddack and another 1.1 innings from Troy Melton, Holton came on as the bridge to closer Will Vest, with Kyle Finnegan likely unavailable after logging two innings the day before. Holton continued his steady play for the Tigers and recorded his 14th hold of the season, which leads the team. He's not in the mix for saves with Vest and Finnegan around, but the lefty has fantasy appeal in leagues that count holds, and he's also chipped in five wins out of the bullpen for good measure.

Atlanta placed Bummer on the 15-day injured list Sunday due to left shoulder inflammation.

The left-hander threw 1.1 scoreless innings Saturday against the Mets, which is presumably when he suffered the injury since that was his first appearance in nearly a week. Bummer will be eligible to be reinstated Sept. 8, though it's unclear if he's expected to be healthy by that point.

Atlanta recalled Stratton from Triple-A Gwinnett on Sunday.

The veteran right-hander was optioned to Gwinnett on Tuesday but will quickly return to Atlanta with Aaron Bummer (shoulder) landing on the injured list. Stratton has given up seven earned runs over 8.2 innings in the majors this year and should fill a low-leverage relief role.