Jackson (2–5) || None || 6,344 || 18–21 |- style="background:#fbb" | 40 || May 26 || Pirates || 3–5 || Tommie Sisk (3–0) || Art Mahaffey (2–3) || None || 10,212 || 18–22 |- style="background:#bbb" | – || May 27 || Pirates || colspan=6 | Postponed (rain and wind); Makeup: July 5 as a traditional double-header |- style="background:#bfb" | 41 || May 28 || Cubs || 3–1 || Ray Culp (2–2) || Bob Buhl (5–3) || Chris Short (1) || 13,663 || 19–22 |- style="background:#bfb" | 42 || May 29 || Cubs || 4–2 || Jim Bunning (4–4) || Larry Jackson (3–5) || None || 4,962 || 20–22 |- style="background:#fbb" | 43 || May 30 || Cubs || 1–4 || Dick Ellsworth (6–3) || Ray Herbert (2–3) || None || 11,696 || 20–23 |- style="background:#fbb" | 44 || May 31 || @ Pirates || 2–5 || Don Cardwell (2–2) || Chris Short (4–6) || Al McBean (8) || 16,366 || 20–24 |- |- style="background:#fbb" | 45 || June 1 || @ Pirates || 0–4 || Bob Veale (5–2) || Art Mahaffey (2–4) || None || 10,478 || 20–25 |- style="background:#bbb" | – || June 2 || @ Pirates || colspan=6 | Postponed (rain); Makeup: July 27 as a traditional double-header |- style="background:#bfb" | 46 || June 4 || @ Cubs || 6–0 || Jim Bunning (5–4) || Larry Jackson (3–6) || None || 3,497 || 21–25 |- style="background:#fbb" | 47 || June 5 || @ Cubs || 8–9 || Lindy McDaniel (2–1) || Gary Wagner (0–1) || None || 6,049 || 21–26 |- style="background:#bfb" | 48 || June 6 (1) || @ Cubs || 2–1 || Ray Culp (3–2) || Bob Buhl (5–5) || None || see 2nd game || 22–26 |- style="background:#bfb" | 49 || June 6 (2) || @ Cubs || 10–9 || Gary Wagner (1–1) || Larry Jackson (3–7) || Ed Roebuck (2) || 16,845 || 23–26 |- style="background:#fbb" | 50 || June 7 || Dodgers || 3–14 || Sandy Koufax (8–3) || Lew Burdette (0–3) || None || 23,345 || 23–27 |- style="background:#fbb" | 51 || June 8 || Dodgers || 1–2 || Claude Osteen (4–6) || Jim Bunning (5–5) || Ron Perranoski (2) || 14,975 || 23–28 |- style="background:#bfb" | 52 || June 9 || Dodgers || 7–3 || Chris Short (5–6) || Mike Kekich (0–1) || None || 16,241 || 24–28 |- style="background:#bfb" |