Steve Rogers (6–1) || Jim Lonborg (3–3) || None || 8,413 || 17–15 |- style="background:#fbb" | 33 || May 15 || Expos || 4–5 || Tom Walker (1–0) || Mac Scarce (3–3) || None || 10,105 || 17–16 |- style="background:#bfb" | 34 || May 16 || Expos || 6–3 || Steve Carlton (4–3) || Mike Torrez (3–3) || None || 7,311 || 18–16 |- style="background:#bbb" | – || May 17 || @ Pirates || colspan=6 | Postponed (rain); Makeup: May 19 as a traditional double-header |- style="background:#bfb" | 35 || May 18 || @ Pirates || 9–2 || Ron Schueler (2–3) || Bob Moose (1–5) || None || 8,021 || 19–16 |- style="background:#bfb" | 36 || May 19 (1) || @ Pirates || 3–2 || Jim Lonborg (4–3) || Dock Ellis (1–4) || Eddie Watt (5) || see 2nd game || 20–16 |- style="background:#fbb" | 37 || May 19 (2) || @ Pirates || 1–2 || Jerry Reuss (2–3) || Dick Ruthven (2–2) || None || 13,426 || 20–17 |- style="background:#bfb" | 38 || May 20 || @ Cardinals || 2–1 || Steve Carlton (5–3) || Lynn McGlothen (5–2) || None || 12,326 || 21–17 |- style="background:#bfb" | 39 || May 21 || @ Cardinals || 4–2 || Ed Farmer (2–0) || John Curtis (2–5) || Mac Scarce (3) || 11,481 || 22–17 |- style="background:#bfb" | 40 || May 22 || @ Cardinals || 7–1 || Ron Schueler (3–3) || Alan Foster (1–4) || None || 10,587 || 23–17 |- style="background:#fbb" | 41 || May 24 || Expos || 2–4 || Ernie McAnally (3–4) || Jim Lonborg (4–4) || None || 14,131 || 23–18 |- style="background:#bfb" | 42 || May 25 (1) || Expos || 4–3 || Eddie Watt (1–0) || Mike Torrez (4–4) || None || see 2nd game || 24–18 |- style="background:#bfb" | 43 || May 25 (2) || Expos || 4–2 || Steve Carlton (6–3) || Steve Renko (3–5) || None || 41,350 || 25–18 |- style="background:#fbb" | 44 || May 26 || Expos || 1–5 || Dennis Blair (1–0) || Ron Schueler (3–4) || None || 27,324 || 25–19 |- style="background:#fbb" | 45 || May 27 || @ Braves || 1–9 || Phil Niekro (6–3) || Ed Farmer (2–1) || None || 6,446 || 25–20 |- style="background:#fbb" | 46 || May 28 || @ Braves || 1–2 (10) || Danny Frisella (1–2) || Jim Lonborg (4–5)