(1–3) || None || 39,191 || 9–9 |- |- style="background:#fbb" | 19 || May 1 || Astros || 0–3 || Jerry Reuss (4–1) || Steve Carlton (4–3) || None || 10,333 || 9–10 |- style="background:#fbb" | 20 || May 2 || Astros || 4–9 || Dave Roberts (2–1) || Jim Lonborg (1–4) || Jim Ray (2) || 8,101 || 9–11 |- style="background:#bfb" | 21 || May 4 || Braves || 5–4 (20) || Jim Lonborg (2–4) || Tom Kelley (0–1) || None || 10,158 || 10–11 |- style="background:#fbb" | 22 || May 5 || Braves || 0–7 || Carl Morton (2–2) || Steve Carlton (4–4) || None || 11,368 || 10–12 |- style="background:#fbb" | 23 || May 6 || Braves || 1–3 || Gary Gentry (3–2) || Mac Scarce (0–1) || None || 60,120 || 10–13 |- style="background:#bfb" | 24 || May 7 || Reds || 3–2 (14) || Barry Lersch (1–0) || Pedro Borbón (0–2) || None || 7,886 || 11–13 |- style="background:#fbb" | 25 || May 8 || Reds || 1–7 || Jack Billingham (5–1) || Dick Ruthven (1–1) || None || 6,196 || 11–14 |- style="background:#fbb" | 26 || May 9 || Reds || 7–9 || Tom Hall (3–1) || Barry Lersch (1–1) || None || 11,992 || 11–15 |- style="background:#fbb" | 27 || May 11 || @ Cubs || 3–4 || Bob Locker (4–1) || Ken Brett (0–1) || Jack Aker (6) || 5,514 || 11–16 |- style="background:#fbb" | 28 || May 12 || @ Cubs || 1–3 || Rick Reuschel (3–2) || Wayne Twitchell (0–1) || None || 15,095 || 11–17 |- style="background:#fbb" | 29 || May 13 (1) || @ Cubs || 2–4 || Ferguson Jenkins (3–3) || Steve Carlton (4–5) || None || see 2nd game || 11–18 |- style="background:#fbb" | 30 || May 13 (2) || @ Cubs || 3–9 || Bill Bonham (2–0) || Dick Ruthven (1–2) || None || 19,242 || 11–19 |- style="background:#bfb" | 31 || May 14 || @ Cardinals || 10–5 || Ken Brett (1–1) || Reggie Cleveland (2–4) || Mac Scarce (3) || 7,677 || 12–19 |- style="background:#fbb" | 32 || May 15 || @ Cardinals || 4–8 || Rick Wise (4–2) || Bucky Brandon (0–1) || None || 7,368 || 12–20 |- style="background:#bfb" | 33 || May 16 || @ Pirates || 5–2 || Wayne Twitchell (1–1) || Dock Ellis (3–4) || Mac Scarce (4)