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Snell, 31, is 0-3 with an 11.57 ERA in three starts. He has yet to recapture the form that allowed him to secure his second Cy Young Award while pitching for the San Diego Padres in 2023.
Snell owns a 71-58 record with a 3.30 ERA in 194 career games (all starts) with the Tampa Bay Rays, Padres and Giants.
Roupp, 25, has registered a 4.35 ERA without recording a decision in eight relief appearances this season with San Francisco.
