September 15 - Yankees set HR mark

This Day in Baseball - The Daily Rewind

• September 15, 1990: Despite solo homers in the 5th by brothers Billy Ripken and Cal Ripken, both off David Wells, the Orioles lose 4 - 3 to Toronto. The brothers would homer together once more in 1996, again in the same inning. The Ripken Brothers joint stint in Baltimore, while managed by their father Cal Sr. from 1987 to 1988, marked the first time a father has managed two of his sons on the same team in the bigs.
• September 15, 2003: With his 2,063rd career base on balls, Barry Bonds passes Babe Ruth on the all-time walks list. The Giant left fielder now only trails Rickey Henderson, who has 2,190 free passes.
• September 15, 1960 - Giants superstar Willie Mays ties a major league mark by hitting three triples in an 8-6 victory over the Phillies.
• September 15, 2003 Rafael Palmeiro joins Jimmie Foxx as the only players to hit 35 homers and drive in 100 runs in nine consecutive seasons. The Hall of Fame member Foxx accomplished the feat playing for the A's and Red Sox from 1932 to 1940.
• September 15, 1961: The Yankees set a new American League record for most homers in a season as they split a doubleheader in Detroit, winning 11 - 1 and losing 4 -2. Round Trippers by Bill Skowron and Yogi Berra in the opener help Whitey Ford win his 24th and increase New York's homer total to 222.