Roberto Clemente erases a 4 – 1 deficit with his two-out, 8th-inning, game-winning grand slam, hit “high and far into the black night, over the 410-foot sign in center-field,” according to Bob Stevens of the San Francisco Chronicle. UPI’s Scott Baillie elaborates, describing “a ball that took off low and gathered altitude like a jet as Willie Mays vainly scaled the left center field fence.” The Bucs tack on one more to beat the Giants by a final score of 6 – 4. The Chronicle’s Phil Berman collars Clemente for some post-game comments: “‘I was looking for an inside pitch,’ said Clemente. ‘I don’t know whether it was a fastball or not, but it came in a little inside and I was ready for it. I know it went out of here fast,’ he grinned. Although Clemente’s drive clears the centerfield fence like a shot, the Pirate outfielder recalls it is not the hardest ball he has hit here. ‘Last year I hit one harder to the left field bleachers (May 6, 1960). That was a high fly ball. But this was a line drive. And I liked this hit better because it won the game.'”

At Los Angeles, the Philadelphia Phillies top the Dodgers, 7 – 5, in 10 innings. Phils reliever Jack Baldschun pitches in his 8th straight game to pick up the win.

Willie Kirkland whacks his 5th home run in three games to help the Cleveland Indians down the Los Angeles Angels, 7 – 5 at Cleveland. His first four were in consecutive at bats before and after the All-Star break and tied the major league record. He now has 16 en route to 27 for the year.

Chicago’s Early Wynn gets an early departure as he retires just two Yankees in the 1st inning. Then Mickey Mantle (30th) and Roger Maris (34th) belt back-to-back homers to send the vet to the showers. For Mantle, it is the 13th homer in his career off Wynn, his favorite target. New York wins, 6 – 2

At Los Angeles, Frank Robinson hits a pair of homers, a double and a single to drive in seven runs and the Reds coast over the Dodgers, 14 – 3.

The Tigers take over first place with a doubleheader sweep of the Angels. Frank Lary’s 13th victory in the opener, a 1 – 0 three-hitter, is followed by Jim Bunning’s 6 – 3 win in the nitecap.

Sherm Lollar’s 9th-inning pinch-hit grand slam, off Frank Funk, for the White Sox, crushes Cleveland, 7 – 5. It is the 5th pinch slam in the American League this season – two by the Sox – and ties the major league record. The Sox also win the second game, 9 – 8. Over the afternoon 8 home runs are hit.

At Yankee Stadium, Whitey Ford tops the Red Sox, 8 – 5. Mickey Mantle hits a home run in the 4th, off Tracy Stallard, for his 10th roundtripper this year in support of Ford.

Solly Hemus (33-41) is fired as manager of the Cardinals and replaced by coach Johnny Keane.

At Yankee Stadium, Roger Maris cracks a 7th-inning solo home run against the Indians, and also is credited – erroneously, as it turns out – with a 3rd inning RBI on a single. The two RBIs are officially recorded, though just one appears in the game’s box score, and the error will not be noted until 1995. With the correction, Maris and Jim Gentile become co-leaders in RBIs for the season.