|| Dodgers || 3–4 (10) || Turk Farrell (3–1) || Chris Short (0–1) || None || 8,529 || 6–16 |- style="background:#fbb" | 23 || May 9 || Dodgers || 2–5 (6) || Don Drysdale (3–2) || Art Mahaffey (2–3) || None || 11,483 || 6–17 |- style="background:#fbb" | 24 || May 10 || Dodgers || 0–6 || Johnny Podres (5–0) || Frank Sullivan (1–3) || None || 8,170 || 6–18 |- style="background:#fbb" | 25 || May 12 || Cardinals || 1–5 || Ernie Broglio (3–3) || John Buzhardt (0–3) || None || 5,463 || 6–19 |- style="background:#bfb" | 26 || May 13 || Cardinals || 3–1 || Art Mahaffey (3–3) || Ray Sadecki (2–2) || None || 5,827 || 7–19 |- style="background:#bfb" | 27 || May 14 || Cardinals || 6–4 || Chris Short (1–1) || Lindy McDaniel (2–2) || None || 4,276 || 8–19 |- style="background:#fbb" | 28 || May 16 || Reds || 2–4 || Joey Jay (3–3) || Frank Sullivan (1–4) || None || 5,428 || 8–20 |- style="background:#fbb" | 29 || May 17 || Reds || 1–2 || Bob Purkey (4–1) || John Buzhardt (0–4) || None || 4,641 || 8–21 |- style="background:#bfb" | 30 || May 19 || Pirates || 4–1 || Art Mahaffey (4–3) || Bob Friend (4–4) || None || 16,035 || 9–21 |- style="background:#fbb" | 31 || May 20 || Pirates || 3–4 || Joe Gibbon (3–2) || Robin Roberts (0–6) || Roy Face (6) || 12,547 || 9–22 |- style="background:#fbb" | 32 || May 21 || Pirates || 11–13 || Bob Friend (5–4) || Don Ferrarese (0–1) || None || 9,291 || 9–23 |- style="background:#bfb" | 33 || May 23 || @ Cubs || 2–1 (10) || Frank Sullivan (2–4) || Glen Hobbie (2–5) || Chris Short (1) || 2,179 || 10–23 |- style="background:#bfb" | 34 || May 24 || @ Braves || 7–1 || Art Mahaffey (5–3) || Don Nottebart (2–3) || None || 9,120 || 11–23 |- style="background:#bbb" | – || May 25 || @ Braves || colspan=6 | Postponed (rain); Makeup: July 5 as a traditional double-header |- style="background:#bbb" | – || May 26 || @ Reds || colspan=6 | Postponed (cold); Makeup: August 2 as a traditional double-header |- style="background:#fbb" | 35 || May 27 || @ Reds || 4–5 || Joey Jay (5–3) || John Buzhardt (0–5) || Jim Brosnan (5) || 7,690 || 11–24 |-