|| Al Holland (6) || 36,916 || 15–16 |- style="background:#bfb" | 32 || May 13 || @ Padres || 8–3 || John Denny (3–3) || Ed Whitson (2–3) || None || 38,645 || 16–16 |- style="background:#bfb" | 33 || May 14 || @ Dodgers || 3–2 || Charles Hudson (4–2) || Jerry Reuss (2–2) || Al Holland (7) || 39,577 || 17–16 |- style="background:#bfb" | 34 || May 15 || @ Dodgers || 12–1 || Jerry Koosman (3–5) || Bob Welch (3–4) || None || 41,620 || 18–16 |- style="background:#bfb" | 35 || May 16 || @ Dodgers || 7–2 || Steve Carlton (2–2) || Fernando Valenzuela (3–5) || None || 48,938 || 19–16 |- style="background:#bfb" | 36 || May 18 || @ Giants || 1–0 || Marty Bystrom (1–1) || Mike Krukow (2–5) || Al Holland (8) || 12,641 || 20–16 |- style="background:#bfb" | 37 || May 19 || @ Giants || 6–2 || John Denny (4–3) || Renie Martin (1–1) || Al Holland (9) || 15,124 || 21–16 |- style="background:#bfb" | 38 || May 20 || @ Giants || 7–4 || Charles Hudson (5–2) || Jeff Robinson (3–5) || Larry Andersen (1) || 23,797 || 22–16 |- style="background:#bfb" | 39 || May 22 || Dodgers || 3–1 || Jerry Koosman (4–5) || Bob Welch (3–5) || Al Holland (10) || 30,190 || 23–16 |- style="background:#fbb" | 40 || May 23 || Dodgers || 0–1 || Fernando Valenzuela (4–5) || Steve Carlton (2–3) || None || 22,864 || 23–17 |- style="background:#bfb" | 41 || May 24 || Dodgers || 4–3 || Al Holland (2–2) || Pat Zachry (2–1) || None || 26,163 || 24–17 |- style="background:#fbb" | 42 || May 25 || Padres || 3–7 || Ed Whitson (4–3) || Charles Hudson (5–3) || None || 25,964 || 24–18 |- style="background:#bfb" | 43 || May 26 || Padres || 7–2 || Marty Bystrom (2–1) || Mark Thurmond (3–3) || None || 32,898 || 25–18 |- style="background:#fbb" | 44 || May 27 || Padres || 0–4 || Tim Lollar (3–4) || Jerry Koosman (4–6) || Craig Lefferts (2) || 34,352 || 25–19 |- style="background:#bbb" | – || May 29 || Giants || colspan=6 | Postponed (rain); Makeup: August 30 as a traditional double-header |- style="background:#bfb" | 45 || May 30 || Giants || 3–2 || Al Holland (3–2) || Greg Minton (1–4) || None || 13,524 || 26–19 |- style="background:#bfb"