The Mets were only 3 ½ games out of first place being hosted by Gene Mauch's fifth place Expos (28-39).
In this twin bill, Cleon Jones would set an MLB record by walking six times in the two games, helping the Mets to the doubleheader sweep.
In the first game a young Nolan Ryan (6-4) went up against Montreal's Jim Britton.
Cleon Jones walked three times in this game, drawing the base on balls from three different pitchers; Btitton, Claude Raymond & Mike Marshall.
In the 1st, Montreal got two lead off singles & an RBI double from Rusty Staub. The Mets answered in the 2nd on a Jerry Grote RBI double, scoring Dave Marshall. In the 5th Marshall would single with the bases loaded scoring Mike Jorgensen for a 2-1 Mets lead.
In the 7th, Jones would draw his would third walk & score on Ed Kranepools two run single.
Nolan Ryan went the distance, allowing one run as he scattered eleven Expo hits. Ryan had great control on this day, walking only one, as he struck out ten earning his 7th win of the year against four losses. On the year he would go 10-14 with a 3.97 ERA with 137 strike outs & 116 walks in 152 innings.
In the night cap, the Mets started Ray Sadecki against Dan McGinn. Cleon Jones walked three more times in this game, in the 1st & 3rd innings off McGinn & later in the 9th inning off reliever Howie Reed.
For New York Danny Frisella got the win in relief of Ray Sadecki. The Mets won this game 4-2, as Bud Harrelson got three hits including a 2nd inning RBI double that tied the game. In the 5th inning, Tim Foli walked, was sacrificed over & stole third. Donn Clendenon was walked & rookie Ken Singleton singled home the second Mets run.
With two outs, Duffy Dyer walked & Harrelson came through with another RBI single, making it 4-1.
Former Met Ron Hunt hit a solo HR for Montreal but the Mets won it 4-2. Danny Frisella had relieved Sadecki in the 5th & pitched 4.2 scoreless innings, allowing two hits. He went on to his fourth win (4-2) going on to have his best season 8-5 with 12 saves & a 1.99 ERA.