Hamels, 39, signed a minor-league pact with the Padres in February with an eye on making his way back to the majors for the first time since undergoing shoulder surgery in 2021. He never appeared in an official game with the San Diego organization.
Hamels' final big-league appearance came with the Atlanta Braves during the 2020 season. He finishes his career having pitched in 423 games and accumulating a 3.43 ERA (123 ERA+) and a 3.34 strikeout-to-walk ratio. He made four All-Star Games and played a pivotal run in the Philadelphia Phillies' 2008 World Series title, winning the Most Valuable Player Award designation in both the National League Championship and the World Series itself.
In addition to that time with the Phillies and Braves, Hamels also suited up as a member of the Texas Rangers and Chicago Cubs. He signed a contract with the Los Angeles Dodgers in 2021 but, as with the Padres, never appeared in an official game with the organization.
Stammen, 39, had not pitched this season after suffering a torn capsule and strained subscapula in spring training. At the time, he suggested that without surgery his ailment could heal in four to six months' time. Still, Stammen was not optimistic about making his way back onto the mound.
"Without saying that I'm done," Stammen told the San Diego Union-Tribune in March, "it's highly unlikely that I pitch again."
Stammen appeared in 562 big-league games over a 13-year career. He amassed a 3.66 ERA (109 ERA+) and a 3.15 strikeout-to-walk ratio. Stammen appeared in games as a member of the Washington Nationals and Padres and spent a minor-league season in the Cleveland Guardians farm system.