The
San Francisco Giants drafted Birdsong in the sixth round, with the 196th overall selection, of the
2022 Major League Baseball draft, signing for an under-slot bonus of $187,500. He spent his first professional season with the rookie-level
Arizona Complex League Giants and Single-A
San Jose Giants, striking out 23 batters in 11 innings. In 2023, Birdsong pitched across three levels (Low-A San Jose, High-A
Eugene Emeralds, and Double-A
Richmond Flying Squirrels), combining for a 2–5 record, a 3.31 ERA, and 149 strikeouts in 100 innings. His 3.31 ERA was the best among Giants minor leaguers with at least 100 innings pitched. On July 4, while pitching for Eugene, he threw five no-hit innings with a career-high 11 strikeouts as part of a combined
no-hitter against the
Tri-City Dust Devils. He made his major league debut that same day at
Oracle Park against the
Chicago Cubs, starting the game and allowing three runs in 4 innings. He made 16 starts for the Giants in his rookie season, finishing with a 5–6 record and a 4.75 ERA with 88 strikeouts in 72 innings pitched in 2024. Birdsong began the 2025 season in the Giants' bullpen, posting a 2.31 ERA in his first 11 relief appearances. On May 20, he made his first start of the season: against the
Kansas City Royals, Birdsong pitched five scoreless innings, allowing five hits and no walks while striking out four, earning the win in a 3–2 Giants victory. He ultimately struggled in the starting role, recording a 6.17 ERA with 27 walks in 42 innings in 10 starts, and was optioned to Triple-A Sacramento on July 22, 2025. On March 19, 2026, it was announced that Birdsong would miss the entirety of the season due to
Tommy John surgery, the result of an elbow issue that lingered during spring training.
Pitching style Birdsong is a 6-foot-4, 215-pound right-handed pitcher who throws four different pitches. His main off-speed pitch is a curveball in the upper-70s to low-80s with significant depth, considered his best bat-missing pitch. He also throws a slider in the mid-80s and a changeup. While initially developed as a starter by the Giants, he has also pitched as a reliever. == Personal life ==