(4–5) || Ron Reed (4–3) || Mark Lee (2) || 24,537 || 15–21(49–42) |- style="background:#bfb" | 92 || September 19 || Pirates || 8–2 || Dan Larson (2–0) || Odell Jones (4–3) || Larry Christenson (1) || 30,446 || 16–21(50–42) |- style="background:#bfb" | 93 || September 20 || Pirates || 5–4 || Sparky Lyle (8–5) || Eddie Solomon (7–5) || None || 31,489 || 17–21(51–42) |- style="background:#fbb" | 94 || September 21 || @ Expos || 0–1 (17) || Bryn Smith (1–0) || Jerry Reed (0–1) || None || 24,161 || 17–22(51–43) |- style="background:#fbb" | 95 || September 22 || @ Expos || 2–6 || Steve Rogers (11–7) || Dick Ruthven (11–6) || None || 21,797 || 17–23(51–44) |- style="background:#bfb" | 96 || September 23 || @ Cardinals || 9–4 || Dickie Noles (2–2) || John Martin (6–5) || Sparky Lyle (2) || 16,845 || 18–23(52–44) |- style="background:#bfb" | 97 || September 24 || @ Cardinals || 14–6 || Mark Davis (1–3) || Lary Sorensen (7–7) || None || 11,758 || 19–23(53–44) |- style="background:#bfb" | 98 || September 25 || @ Cubs || 9–2 || Dan Larson (3–0) || Ken Kravec (1–6) || None || 4,482 || 20–23(54–44) |- style="background:#bbb" | – || September 26 || @ Cubs || colspan=6 | Postponed (rain); Makeup: September 27 as a traditional double-header |- style="background:#bfb" | 99 || September 27 (1) || @ Cubs || 5–2 || Steve Carlton (13–4) || Doug Bird (9–6) || None || see 2nd game || 21–23(55–44) |- style="background:#fbb" | 100 || September 27 (2) || @ Cubs || 0–14 || Mike Krukow (9–9) || Dick Ruthven (11–7) || None || 18,783 || 21–24(55–45) |- style="background:#bfb" | 101 || September 28 || Mets || 12–4 || Larry Christenson (4–6) || Ed Lynch (4–5) || None || 20,403 || 22–24(56–45) |- style="background:#fbb" | 102 || September 29 || Mets || 0–7 || Pete Falcone (4–3) || Mark Davis (1–4) || None || 20,110 || 22–25(56–46) |- style="background:#bfb" | 103 || September 30 || Cardinals || 8–5 || Sparky Lyle (9–5) || Luis DeLeón (0–1) || Ron Reed (8) || 21,382 || 23–25(57–46) |- |- style="background:#fbb" | 104 || October 1 || Cardinals || 2–3 (10) || Doug Bair (4–2) || Larry Christenson (4–7) || None || 20,482 || 23–26(57–47) |- style="background:#bfb" | 105 || October 2 || Cubs || 9–7 || Ron Reed (5–3) || Dick Tidrow (3–10) ||