1–4 || Tom Glavine (5–5) || Pat Combs (4–7) || Joe Boever (8) || 18,286 || 38–38 |- style="background:#fbb" | 77 || July 5 || Reds || 2–9 || Jack Armstrong (11–3) || Ken Howell (8–6) || None || 19,961 || 38–39 |- style="background:#fbb" | 78 || July 6 || Reds || 1–4 || Danny Jackson (3–2) || José DeJesús (0–2) || Randy Myers (17) || 28,501 || 38–40 |- style="background:#fbb" | 79 || July 7 || Reds || 0–5 || Rick Mahler (3–3) || Bruce Ruffin (6–8) || None || 29,515 || 38–41 |- style="background:#bfb" | 80 || July 8 || Reds || 4–3 || Darrel Akerfelds (3–0) || Norm Charlton (6–3) || None || 31,602 || 39–41 |- style="background:#bbcaff;" | – || July 10 ||colspan="7" |1990 Major League Baseball All-Star Game at Wrigley Field in Chicago |- style="background:#fbb" | 81 || July 12 || @ Astros || 4–7 || Bill Gullickson (6–6) || Bruce Ruffin (6–9) || Dave Smith (17) || 16,983 || 39–42 |- style="background:#bfb" | 82 || July 13 || @ Astros || 4–2 || José DeJesús (1–2) || Mike Scott (6–9) || Darrel Akerfelds (2) || 15,248 || 40–42 |- style="background:#bfb" | 83 || July 14 || @ Astros || 12–8 || Pat Combs (5–7) || Jim Deshaies (4–8) || None || 28,308 || 41–42 |- style="background:#fbb" | 84 || July 15 || @ Astros || 1–6 || Danny Darwin (3–1) || Jeff Parrett (3–7) || None || 19,616 || 41–43 |- style="background:#bfb" | 85 || July 16 || @ Braves || 7–2 || Terry Mulholland (4–3) || Marty Clary (1–6) || None || 8,211 || 42–43 |- style="background:#fbb" | 86 || July 17 || @ Braves || 10–14 || Tom Glavine (6–6) || Bruce Ruffin (6–10) || Kent Mercker (1) || 8,558 || 42–44 |- style="background:#bfb" | 87 || July 18 || @ Braves || 4–3 || Dennis Cook (6–2) || John Smoltz (6–7) || Darrel Akerfelds (3) || 8,706 || 43–44 |- style="background:#bfb" | 88 || July 19 || @ Reds || 5–2 || Pat Combs (6–7) || Jack Armstrong (11–5) || Roger McDowell (14) || 37,163 || 44–44 |- style="background:#fbb" | 89 || July 20 || @ Reds || 1–5 || Norm Charlton (8–4) || Jeff Parrett (3–8) || Rob Dibble (8) || 39,394 || 44–45 |- style="background:#fbb" | 90 || July 21 || @ Reds || 1–6 || José Rijo (6–3)