Boggs (2–0) || Ed Farmer (2–5) || Gene Garber (26) || 29,380 || 73–59 |- |- style="background:#fbb" | 133 || September 1 || Braves || 0–4 || Rick Camp (11–7) || Mike Krukow (12–8) || Gene Garber (27) || 24,788 || 73–60 |- style="background:#bfb" | 134 || September 3 || Astros || 2–1 || Steve Carlton (18–9) || Joe Niekro (13–10) || None || 28,320 || 74–60 |- style="background:#bfb" | 135 || September 4 || Astros || 4–2 || Sid Monge (6–1) || Bob Knepper (5–14) || Ron Reed (9) || 35,747 || 75–60 |- style="background:#bfb" | 136 || September 5 || Astros || 4–3 || Porfi Altamirano (3–0) || Nolan Ryan (14–10) || Ron Reed (10) || 33,983 || 76–60 |- style="background:#fbb" | 137 || September 6 || @ Cubs || 3–4 || Doug Bird (9–11) || Mike Krukow (12–9) || Lee Smith (12) || 23,510 || 76–61 |- style="background:#bfb" | 138 || September 7 || @ Cubs || 7–5 || Tug McGraw (3–3) || Bill Campbell (3–5) || None || 7,003 || 77–61 |- style="background:#bfb" | 139 || September 8 || @ Cubs || 4–3 || Steve Carlton (19–9) || Dick Tidrow (6–3) || Ron Reed (11) || 8,233 || 78–61 |- style="background:#bfb" | 140 || September 10 || @ Pirates || 7–5 || Dick Ruthven (11–10) || John Candelaria (12–6) || Sid Monge (2) || 15,596 || 79–61 |- style="background:#fbb" | 141 || September 11 || @ Pirates || 9–10 || Kent Tekulve (11–8) || Ron Reed (4–5) || None || 19,842 || 79–62 |- style="background:#fbb" | 142 || September 12 || @ Pirates || 2–4 || Rick Rhoden (10–12) || Larry Christenson (8–10) || Kent Tekulve (19) || 19,089 || 79–63 |- style="background:#bfb" | 143 || September 13 || Cardinals || 2–0 || Steve Carlton (20–9) || Bob Forsch (14–9) || None || 40,109 || 80–63 |- style="background:#fbb" | 144 || September 14 || Cardinals || 0–2 || John Stuper (7–6) || Mike Krukow (12–10) || Bruce Sutter (32) || 32,854 || 80–64 |- style="background:#fbb" | 145 || September 15 || Cardinals || 0–8 || Joaquín Andújar (13–10) || John Denny (6–12) || None || 33,337 || 80–65 |- style="background:#fbb" | 146 || September 17 || Pirates || 2–4 || Rick Rhoden (11–12) || Steve Carlton (20–10) || Kent Tekulve (20) || 37,262 || 80–66 |- style="background:#bfb" | 147 || September 18 || Pirates || 5–4