Lew Burdette (16–9) || Frank Sullivan (3–15) || None || 8,018 || 39–95–1 |- style="background:#fbb" | 136 || September 6 || @ Braves || 0–1 || Warren Spahn (18–12) || John Buzhardt (5–16) || None || 10,090 || 39–96–1 |- style="background:#fbb" | 137 || September 8 || @ Cubs || 1–4 || Dick Ellsworth (8–10) || Art Mahaffey (10–19) || None || 1,533 || 39–97–1 |- style="background:#bfb" | 138 || September 9 || @ Cubs || 6–2 || Jim Owens (4–9) || Jack Curtis (10–11) || None || 7,110 || 40–97–1 |- style="background:#bfb" | 139 || September 10 || @ Cubs || 14–6 || Don Ferrarese (4–9) || Barney Schultz (7–4) || Frank Sullivan (5) || 7,628 || 41–97–1 |- style="background:#fbb" | 140 || September 11 || @ Dodgers || 5–6 (11) || Ron Perranoski (7–5) || Don Ferrarese (4–10) || None || 9,064 || 41–98–1 |- style="background:#bfb" | 141 || September 12 || @ Dodgers || 19–10 || Chris Short (6–10) || Sandy Koufax (15–11) || Jack Baldschun (2) || 8,629 || 42–98–1 |- style="background:#fbb" | 142 || September 13 || @ Giants || 2–8 || Jim Duffalo (4–0) || Dallas Green (2–4) || None || 5,585 || 42–99–1 |- style="background:#bfb" | 143 || September 14 || @ Giants || 4–3 (10) || John Buzhardt (6–16) || Dick LeMay (3–6) || None || 4,328 || 43–99–1 |- style="background:#fbb" | 144 || September 16 || @ Reds || 2–3 || Jim O'Toole (16–9) || Jim Owens (4–10) || Jim Brosnan (15) || 8,376 || 43–100–1 |- style="background:#bfb" | 145 || September 17 || @ Reds || 4–0 || Art Mahaffey (11–19) || Bob Purkey (16–11) || Frank Sullivan (6) || 14,671 || 44–100–1 |- style="background:#fbb" | 146 || September 19 || @ Cardinals || 0–3 || Curt Simmons (9–10) || John Buzhardt (6–17) || None || 4,935 || 44–101–1 |- style="background:#bfb" | 147 || September 20 || @ Cardinals || 6–1 || Don Ferrarese (5–10) || Ernie Broglio (9–12) || None || 5,113 || 45–101–1 |- style="background:#fbb" | 148 || September 22 || Pirates || 2–3 || Clem Labine (4–1) || Frank Sullivan (3–16) || None || 4,687 || 45–102–1 |- style="background:#bfb" | 149 || September 23 || Pirates || 5–4 (16) || Jack Baldschun (5–3) || Roy Face (6–12) || None || 4,005 || 46–102–1 |- style="background:#fbb" | 150 || September 24 || Pirates || 3–4 || Vinegar Bend