@ Expos || 5–1 || Wayne Simpson (1–0) || Steve Renko (5–12) || Gene Garber (13) || 9,216 || 77–68 |- style="background:#bfb" | 146 || September 11 || @ Expos || 5–0 (7) || Larry Christenson (10–5) || Steve Rogers (10–11) || None || 7,457 || 78–68 |- style="background:#fbb" | 147 || September 13 || @ Cubs || 1–4 || Ray Burris (14–10) || Tom Underwood (14–11) || None || 13,283 || 78–69 |- style="background:#bfb" | 148 || September 14 || @ Cubs || 13–7 || Steve Carlton (13–13) || Steve Stone (12–8) || None || 16,294 || 79–69 |- style="background:#fbb" | 149 || September 15 || @ Cardinals || 6–7 || Al Hrabosky (12–3) || Gene Garber (9–11) || Harry Parker (3) || 9,955 || 79–70 |- style="background:#bfb" | 150 || September 16 || @ Cardinals || 4–3 (13) || Tom Hilgendorf (7–3) || Mike Garman (3–7) || Gene Garber (14) || 11,239 || 80–70 |- style="background:#fbb" | 151 || September 17 || Pirates || 1–9 || Bruce Kison (11–11) || Tom Underwood (14–12) || None || 38,085 || 80–71 |- style="background:#bfb" | 152 || September 18 || Pirates || 4–1 || Steve Carlton (14–13) || Dock Ellis (8–9) || None || 27,093 || 81–71 |- style="background:#bfb" | 153 || September 19 || @ Mets || 4–3 || Tug McGraw (9–5) || Skip Lockwood (1–2) || None || 16,676 || 82–71 |- style="background:#fbb" | 154 || September 20 || @ Mets || 7–9 (11) || Bob Apodaca (2–3) || Gene Garber (9–12) || None || 18,863 || 82–72 |- style="background:#bfb" | 155 || September 21 || @ Mets || 4–2 || Dick Ruthven (2–2) || Jon Matlack (16–12) || Tug McGraw (14) || 52,144 || 83–72 |- style="background:#fbb" | 156 || September 22 || @ Pirates || 3–11 || Bruce Kison (12–11) || Tom Underwood (14–13) || Kent Tekulve (4) || 13,176 || 83–73 |- style="background:#fbb" | 157 || September 23 || @ Pirates || 1–3 || Bob Moose (2–2) || Steve Carlton (14–14) || None || 6,445 || 83–74 |- style="background:#bfb" | 158 || September 24 || @ Pirates || 8–1 || Larry Christenson (11–5) || Larry Demery (7–5) || None || 6,253 || 84–74 |- style="background:#bfb" | 159 || September 26 (1) || Mets || 4–3 (12) || Gene Garber (10–12) || Bob Apodaca (3–4) || None || see 2nd game || 85–74 |- style="background:#fbb" | 160