In his debut season of 2017, Margevicius played for the rookie-level Arizona League Padres and the Low-A Tri-City Dust Devils. He accumulated a 4–1 record with a 1.31 ERA and 62 strikeouts over 48 innings. Margevicius split the 2018 season between the Single-A Fort Wayne TinCaps and High-A Lake Elsinore Storm, accumulating a 10–8 record with a 3.60 ERA and 146 strikeouts in 134+1⁄3 innings pitched.[2] Margevicius appeared in one game with the Double-A San Antonio Missions during the 2018 Texas League playoffs.[7]
Major leagues
Margevicius was called up by the Padres on March 30, 2019, and made his major league debut that evening.[8] He recorded five plus innings, allowing one run, while striking out five.[9] Upon selecting what number to wear, Margevicius chose to wear number 25 after his favorite player growing up for his hometown Cleveland Indians was Jim Thome. He became the second player from the 2017 draft class to reach MLB.[8] He was optioned to the Amarillo Sod Poodles on May 17, and was recalled on June 1.[10] He was optioned once again on June 19, returned on August 28, and remained with the Padres thru the remainder of the 2019 season.[11] Margevicius was designated for assignment on January 17, 2020.
Seattle Mariners
On January 24, 2020, Margevicius was claimed off waivers by the Seattle Mariners.[12] After an injury to the neck caused starter Kendall Graveman to go on the 10-Day disabled list, Margevicius replaced him as the starter.[13] In his debut as a starter for the Mariners, Margevicius pitched 3+1⁄3 scoreless innings against the Colorado Rockies while recording 3 strikeouts. Margevicius earned his 1st win as a Mariner when he pitched 5+1⁄3 innings against the Texas Rangers giving up 4 earned runs on 6 hits and 1 walk while striking out 7 batters. Margevicius earned his 2nd win as a starter for the Mariners during his last start of the season when he pitched 6 scoreless innings against the defending AL Pennant winners Houston Astros recording 4 strikeouts in the process. Margevicius finished the season with a 2–3 record and a 4.57 ERA.
Margevicius made five appearances for the Mariners in 2021, compiling an 0-2 record and 8.25 ERA with 12 strikeouts across 12 innings of work. On May 13, 2021, Margevicius was placed on the 60-day injured list after being diagnosed with thoracic outlet syndrome.[14]
Margevicius was designated for assignment by Seattle on May 5, 2022.[15] On May 9, Margevicius cleared waivers and was sent outright to the Triple-A Tacoma Rainiers.[16] In 33 appearances (seven starts) for Tacoma, he struggled to an 0-4 record and 7.53 ERA with 51 strikeouts over 49 innings of work. Margevicius was released by the Mariners organization on March 6, 2023.[17]
Atlanta Braves
On April 4, 2023, Margevicius signed a minor league contract with the Atlanta Braves.[18] In 20 games split between the Triple–A Gwinnett Stripers and Double–A Mississippi Braves, he registered a combined 6.82 ERA with 49 strikeouts across 68+2⁄3 innings pitched. Margevicius elected free agency following the season on November 6.[19]
TSG Hawks
On January 22, 2024, Margevicius signed with the TSG Hawks of the Chinese Professional Baseball League.[20] In 18 starts for the Hawks, he compiled a 7-6 record and 2.82 ERA with 86 strikeouts across 108+1⁄3 innings pitched. Margevicius became a free agent following the season.
Tecolotes de los Dos Laredos
On March 7, 2025, Margevicius signed with the Tecolotes de los Dos Laredos of the Mexican League.[21] In two starts for Dos Laredos, Margevicius posted a 2-0 record and 0.87 ERA with seven strikeouts across 10+1⁄3 innings pitched.
Detroit Tigers
On April 29, 2025, Margevicius signed a minor league contract with the Detroit Tigers.[22] He made 17 appearances (14 starts) for the Triple-A Toledo Mud Hens, registering a 5-3 record and 3.89 ERA with 70 strikeouts over 74 innings of work. Margevicius elected free agency following the season on November 6.[23]
San Francisco Giants
On December 26, 2025, Margevicius signed a minor league contract with the San Francisco Giants.[24]
