| 70 || June 25 || @ Cardinals || 9–10 || Scott Terry (2–1) || Roger McDowell (3–5) || Lee Smith (19) || 30,798 || 30–40 |- style="background:#fbb" | 71 || June 26 || @ Cardinals || 1–14 || Bryn Smith (6–4) || Pat Combs (2–6) || None || 25,706 || 30–41 |- style="background:#fbb" | 72 || June 27 || @ Cardinals || 2–4 || Ken Hill (7–5) || Tommy Greene (5–1) || Lee Smith (20) || 26,419 || 30–42 |- style="background:#bfb" | 73 || June 28 || @ Mets || 6–2 || José DeJesús (5–3) || Ron Darling (4–5) || None || 33,511 || 31–42 |- style="background:#fbb" | 74 || June 29 || @ Mets || 0–5 || Wally Whitehurst (4–4) || Terry Mulholland (6–8) || None || 46,244 || 31–43 |- style="background:#bfb" | 75 || June 30 || @ Mets || 10–9 || Danny Cox (3–1) || Dwight Gooden (7–6) || Mitch Williams (13) || 44,310 || 32–43 |- |- style="background:#fbb" | 76 || July 1 || Cardinals || 0–1 || Bryn Smith (7–4) || Bruce Ruffin (1–1) || Lee Smith (21) || 17,281 || 32–44 |- style="background:#fbb" | 77 || July 2 || Cardinals || 1–6 || Ken Hill (8–5) || Tommy Greene (5–2) || Lee Smith (22) || 16,847 || 32–45 |- style="background:#fbb" | 78 || July 3 || Cardinals || 3–4 || Omar Olivares (2–1) || José DeJesús (5–4) || Lee Smith (23) || 50,156 || 32–46 |- style="background:#bfb" | 79 || July 4 || Cardinals || 7–1 || Terry Mulholland (7–8) || Bob Tewksbury (6–5) || None || 14,921 || 33–46 |- style="background:#fbb" | 80 || July 5 || Mets || 1–3 || Dwight Gooden (8–6) || Danny Cox (3–2) || John Franco (18) || 51,314 || 33–47 |- style="background:#fbb" | 81 || July 6 || Mets || 1–2 || Frank Viola (10–5) || Bruce Ruffin (1–2) || John Franco (19) || 35,067 || 33–48 |- style="background:#fbb" | 82 || July 7 || Mets || 2–8 || David Cone (8–5) || Tommy Greene (5–3) || None || 35,444 || 33–49 |- style="background:#bbcaff;" | – || July 9 ||colspan="7" |1991 Major League Baseball All-Star Game at SkyDome in Toronto |- style="background:#bfb" | 83 || July 11 || Giants || 3–2 || Terry Mulholland (8–8) || Trevor Wilson (4–8) || Mitch Williams (14) || 22,355 || 34–49 |- style="background:#bfb" | 84 || July 12 || Giants