September 3 || @ Braves || 2–0 || Ray Culp (12–11) || Denny Lemaster (11–9) || None || 4,949 || 74–65 |- style="background:#bfb" | 140 || September 4 || @ Reds || 3–2 || Dennis Bennett (8–2) || Jim O'Toole (17–12) || None || 4,906 || 75–65 |- style="background:#fbb" | 141 || September 6 || Braves || 0–5 || Bob Shaw (6–10) || Cal McLish (13–10) || None || 10,767 || 75–66 |- style="background:#fbb" | 142 || September 7 || Braves || 4–6 (10) || Bobby Tiefenauer (1–1) || Jack Baldschun (10–7) || None || 11,589 || 75–67 |- style="background:#fbb" | 143 || September 8 || Braves || 2–3 || Warren Spahn (20–5) || Dallas Green (5–4) || None || 8,807 || 75–68 |- style="background:#fbb" | 144 || September 9 || Mets || 3–6 || Roger Craig (5–20) || Dennis Bennett (8–3) || None || 3,232 || 75–69 |- style="background:#bfb" | 145 || September 10 || Colt .45s || 16–0 || Chris Short (6–11) || Don Nottebart (9–7) || None || 3,645 || 76–69 |- style="background:#fbb" | 146 || September 11 || Colt .45s || 2–4 || Turk Farrell (12–13) || Cal McLish (13–11) || None || 3,412 || 76–70 |- style="background:#bfb" | 147 || September 12 || Colt .45s || 4–1 || Ray Culp (13–11) || Hal Brown (5–11) || None || 2,849 || 77–70 |- style="background:#bfb" | 148 || September 13 (1) || Dodgers || 3–2 || Chris Short (7–11) || Larry Sherry (2–6) || None || see 2nd game || 78–70 |- style="background:#fbb" | 149 || September 13 (2) || Dodgers || 1–2 || Ron Perranoski (15–3) || Dennis Bennett (8–4) || None || 26,024 || 78–71 |- style="background:#fbb" | 150 || September 14 || Dodgers || 1–5 || Pete Richert (5–1) || John Boozer (2–4) || None || 10,410 || 78–72 |- style="background:#bfb" | 151 || September 15 || Dodgers || 6–1 || Dallas Green (6–4) || Don Drysdale (17–17) || None || 16,796 || 79–72 |- style="background:#bfb" | 152 || September 17 || @ Mets || 8–6 || Ray Culp (14–11) || Tracy Stallard (6–16) || Johnny Klippstein (8) || 2,047 || 80–72 |- style="background:#bfb" | 153 || September 18 || @ Mets || 5–1 || Chris Short (8–11) || Craig Anderson (0–1) || None || 1,752 || 81–72 |- style="background:#fbb" | 154 || September 20 || @ Colt .45s || 2–3 || Ken Johnson