36 || May 16 || Giants || 5–13 || Atlee Hammaker (2–3) || Mike Maddux (1–2) || None || 14,074 || 16–20 |- style="background:#fbb" | 37 || May 17 || Giants || 0–6 || Rick Reuschel (7–2) || Ken Howell (4–2) || None || 18,943 || 16–21 |- style="background:#fbb" | 38 || May 19 || Padres || 2–8 || Ed Whitson (6–2) || Larry McWilliams (2–3) || None || 28,224 || 16–22 |- style="background:#fbb" | 39 || May 20 || Padres || 2–3 || Dennis Rasmussen (2–4) || Don Carman (1–6) || Greg W. Harris (3) || 28,866 || 16–23 |- style="background:#bfb" | 40 || May 21 || Padres || 3–1 || Bob Sebra (1–0) || Walt Terrell (3–5) || Steve Bedrosian (4) || 38,346 || 17–23 |- style="background:#bfb" | 41 || May 23 || @ Dodgers || 4–1 || Ken Howell (5–2) || Fernando Valenzuela (0–4) || Steve Bedrosian (5) || 32,199 || 18–23 |- style="background:#fbb" | 42 || May 24 || @ Dodgers || 2–4 || Tim Leary (3–3) || Larry McWilliams (2–4) || Jay Howell (7) || 37,089 || 18–24 |- style="background:#fbb" | 43 || May 25 || @ Dodgers || 6–7 || Tim Belcher (4–4) || Don Carman (1–7) || Jay Howell (8) || 27,781 || 18–25 |- style="background:#fbb" | 44 || May 26 || @ Giants || 1–6 || Scott Garrelts (3–1) || Bob Sebra (1–1) || None || 12,787 || 18–26 |- style="background:#fbb" | 45 || May 27 || @ Giants || 2–6 || Atlee Hammaker (4–3) || Alex Madrid (1–2) || Craig Lefferts (8) || 18,325 || 18–27 |- style="background:#fbb" | 46 || May 28 || @ Giants || 5–8 || Rick Reuschel (9–2) || Ken Howell (5–3) || Mike LaCoss (6) || 51,498 || 18–28 |- style="background:#fbb" | 47 || May 29 || @ Padres || 0–1 || Bruce Hurst (5–3) || Larry McWilliams (2–5) || Mark Davis (16) || 21,161 || 18–29 |- style="background:#fbb" | 48 || May 30 || @ Padres || 3–9 || Ed Whitson (8–2) || Don Carman (1–8) || None || 11,710 || 18–30 |- style="background:#fbb" | 49 || May 31 || @ Padres || 1–2 || Greg W. Harris (1–2) || Jeff Parrett (1–2) || Mark Davis (17) || 15,768 || 18–31 |- style="background:#fbb" | 50 || June 2 || Expos || 1–2 || Steve Frey (1–0) || Greg A. Harris (1–1) || Joe Hesketh (2)