On January 16, 2020, he was a non-roster invitee of the Detroit Tigers to Spring Training before the season was postponed due to the coronavirus.[21] The Tigers added him to their 40-man roster after the year.[22]
Major leagues
2021
On June 15, 2021, it was announced that Manning would be promoted to the major leagues for the first time and make his MLB debut on June 17 as the starting pitcher against the Los Angeles Angels.[23] In his debut, Manning pitched five innings, allowing two runs and striking out three, while taking the loss.[24] In his next start on June 23, his home debut for the Tigers, Manning earned his first major league win over the St. Louis Cardinals, allowing two runs over 5+2⁄3 innings.[25]
2022
Manning started the 2022 season in the Tigers rotation. On April 20, he was placed on the 10-day injured list due to right shoulder inflammation, retroactive to April 17. Due to suffering a setback in one of his rehab starts, Manning did not return to the Tigers until making a start against the Minnesota Twins on August 2.[26] On August 24, Manning pitched six shoutout innings with a career-high eight strikeouts in a win over the San Francisco Giants.[27]
2023
Manning made two starts for Detroit in 2023 before suffering a fracture in his right foot after being hit by a line drive on April 11.[28] On April 29, Manning was placed on the 60-day injured list.[29] He was activated ahead of a start against the Texas Rangers on June 27.[30] On July 8, Manning pitched the first 6.2 innings of a combined no-hitter with relief pitchers Jason Foley and Alex Lange against the Toronto Blue Jays.[31] On September 6, Manning's season was ended when another line drive fractured his foot for the second time. The hit by Giancarlo Stanton was measured at 119.5 miles per hour (192.3km/h).[32]
2024
Manning was optioned by the Tigers to Triple–A Toledo to begin the 2024 season after Casey Mize and Reese Olson won the final rotation spots.[33] Manning was recalled on April 4 to start against the New York Mets as the 27th man in a doubleheader. He was recalled again to start in an April 13 doubleheader against the Minnesota Twins,[34] and a third time for an April 30 doubleheader against the St. Louis Cardinals.[35] In 5 total starts for Detroit, he logged an 0-1 record and 4.88 ERA with 23 strikeouts across 27+2⁄3 innings pitched.[36]
2025
Manning was optioned to the Triple-A Toledo Mud Hens to begin the 2025 season.[37] In 31 appearances (four starts) for Toledo, he posted a 2-2 record and 6.04 ERA with 52 strikeouts and two saves across 50+2⁄3 innings pitched. Manning was subsequently designated for assignment on July 31, 2025 following the acquisition of Paul Sewald from the Cleveland Guardians.[38]
Philadelphia Phillies
On July 31, 2025, the Tigers traded Manning to the Philadelphia Phillies in exchange for Josueth Quinonez.[39] In two starts for the Triple-A Lehigh Valley IronPigs, he struggled to an 0-1 record and 10.80 ERA with eight strikeouts over five innings of work. On September 12, Manning was designated for assignment by the Phillies.[40] He cleared waivers and was sent outright to the Double-A Reading Fightin Phils on September 15.[41] Manning elected free agency following the season on November 6.[42][43]
Samsung Lions
On November 29, 2025, Manning signed with the Samsung Lions of the KBO League.[44] In a practice game prior to the season, he suffered an elbow injury that would require Tommy John surgery and was subsequently ruled out for the season.[45]
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