None || 17,272 || 56–82–1 |- style="background:#fbb" | 140 || September 7 || Cubs || 2–6 || Mike Bielecki (15–6) || Ken Howell (11–11) || None || 13,058 || 56–83–1 |- style="background:#bfb" | 141 || September 8 || @ Expos || 4–3 || Jason Grimsley (1–0) || Kevin Gross (11–10) || Roger McDowell (17) || 18,151 || 57–83–1 |- style="background:#fbb" | 142 || September 9 || @ Expos || 5–6 || Tim Burke (8–3) || Jeff Parrett (12–5) || None || 22,981 || 57–84–1 |- style="background:#bfb" | 143 || September 10 || @ Expos || 4–2 || Pat Combs (1–0) || Pascual Pérez (8–13) || Roger McDowell (18) || 22,630 || 58–84–1 |- style="background:#fbb" | 144 || September 11 || Mets || 2–5 || Ron Darling (13–12) || Bruce Ruffin (5–9) || Randy Myers (23) || 18,690 || 58–85–1 |- style="background:#bfb" | 145 || September 12 || Mets || 2–1 || Roger McDowell (4–6) || Don Aase (1–5) || None || 22,953 || 59–85–1 |- style="background:#fbb" | 146 || September 13 || Mets || 4–10 || Bob Ojeda (12–10) || Jason Grimsley (1–1) || None || 20,062 || 59–86–1 |- style="background:#bfb" | 147 || September 15 || Cardinals || 2–0 || Pat Combs (2–0) || Ken Hill (7–13) || None || || 60–86–1 |- style="background:#fbb" | 148 || September 15 || Cardinals || 6–7 || John Costello (4–3) || Roger McDowell (4–7) || None || 22,579 || 60–87–1 |- style="background:#bbb" | – || September 16 || Cardinals || colspan=6 | Postponed (rain); |- style="background:#bfb" | 149 || September 17 || Cardinals || 9–5 || Dennis Cook (6–7) || Matt Kinzer (0–2) || None || || 61–87–1 |- style="background:#fbb" | 150 || September 17 || Cardinals || 0–2 || Cris Carpenter (4–4) || Ken Howell (11–12) || John Costello (2) || 23,043 || 61–88–1 |- style="background:#fbb" | 151 || September 18 || @ Pirates || 2–6 || Bob Patterson (3–2) || Jason Grimsley (1–2) || Randy Kramer (2) || 7,665 || 61–89–1 |- style="background:#fbb" | 152 || September 19 || @ Pirates || 2–4 || Jeff Robinson (7–11) || Bruce Ruffin (5–10) || Bill Landrum (24) || 8,156 || 61–90–1 |- style="background:#bfb" | 153 || September 20 || @ Cubs || 9–8 || Don Carman (5–15) || Les Lancaster (3–2) || Roger McDowell (19) || 21,620 || 62–90–1 |- style="background:#fbb" | 154 || September 21 || @ Cubs || 1–9 ||