(0–2) || None || 8,731 || 14–13 |- style="background:#bfb" | 28 || May 18 || Cardinals || 4–3 || Ray Culp (1–3) || Bob Gibson (3–5) || None || 11,169 || 15–13 |- style="background:#fbb" | 29 || May 19 || Cardinals || 0–2 || Al Jackson (3–1) || Larry Jackson (1–5) || Joe Hoerner (1) || 8,972 || 15–14 |- style="background:#bfb" | 30 || May 20 || @ Astros || 6–5 (10) || Darold Knowles (4–0) || Jim Owens (3–2) || None || 29,763 || 16–14 |- style="background:#fbb" | 31 || May 21 || @ Astros || 3–4 (11) || Don Lee (2–0) || Bob Buhl (0–1) || None || 30,229 || 16–15 |- style="background:#bfb" | 32 || May 22 || @ Astros || 6–1 || Jim Bunning (5–1) || Barry Latman (2–4) || None || 20,991 || 17–15 |- style="background:#bfb" | 33 || May 23 || @ Astros || 9–0 || Larry Jackson (2–5) || Dave Giusti (4–3) || None || 12,384 || 18–15 |- style="background:#fbb" | 34 || May 24 || @ Dodgers || 2–3 || Don Sutton (6–4) || Bob Buhl (0–2) || Ron Perranoski (3) || 20,286 || 18–16 |- style="background:#fbb" | 35 || May 25 || @ Dodgers || 1–2 || Don Drysdale (3–4) || Chris Short (4–4) || None || 19,572 || 18–17 |- style="background:#fbb" | 36 || May 26 || @ Giants || 0–1 (14) || Juan Marichal (9–0) || Darold Knowles (4–1) || None || 7,529 || 18–18 |- style="background:#bfb" | 37 || May 27 || @ Giants || 9–2 || Larry Jackson (3–5) || Ray Sadecki (2–3) || None || 16,063 || 19–18 |- style="background:#bfb" | 38 || May 28 || @ Giants || 2–0 || Ray Culp (2–3) || Joe Gibbon (2–2) || Darold Knowles (2) || 17,331 || 20–18 |- style="background:#fbb" | 39 || May 29 || @ Giants || 5–6 (10) || Lindy McDaniel (3–2) || Bo Belinsky (0–1) || None || 25,237 || 20–19 |- style="background:#bfb" | 40 || May 30 (1) || @ Mets || 7–2 || Jim Bunning (6–1) || Gordie Richardson (0–2) || None || see 2nd game || 21–19 |- style="background:#fbb" | 41 || May 30 (2) || @ Mets || 1–3 || Jack Fisher (2–5) || Bob Buhl (0–3) || None || 46,882 || 21–20 |- style="background:#bfb" | 42 || May 31 || @ Mets || 6–4 || Ray Herbert (1–2) ||