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Sewald is a career 20-25 with 84 saves and a 4.09 ERA in 359 relief appearances for the New York Mets (2017-20), Seattle Mariners (2021-23) and Diamondbacks.
Moreno, 24, left the Aug. 5 game against the host Cleveland Guardians in the second inning after running out a ground-ball single. He went on the 10-day IL on Aug. 6 after an MRI showed a strained left adductor muscle.
Moreno is batting .262 with five home runs and 41 RBIs in 86 games this season. He is a career .279 hitter with 13 homers and 98 RBIs in 222 games with the Toronto Blue Jays (2022) and Diamondbacks (2023-present).
Walston, 23, is 0-0 with a 2.84 ERA, nine walks and 11 strikeouts in 12 2/3 innings over three games (two starts) since making his major league debut on May 1. He was 3-2 with a 4.85 ERA, 31 walks and 68 strikeouts in 65 innings over 14 games (13 starts) at Triple-A.
Floro, 33, was 3-1 with a 9.37 ERA, four walks and eight strikeouts in 16 1/3 innings over 15 relief appearances for Arizona, which acquired him in a July 30 trade with the Washington Nationals for first baseman Andres Chaparro.
Floro was 3-3 with a 2.06 ERA in 52 1/3 innings over 51 relief appearances this season for the Nationals. He is a career 32-26 with 32 saves and a 3.49 ERA in 396 relief appearances for eight different teams since 2016.