9 – Dennis Martínez of the Atlanta Braves defeats the San Francisco Giants 7–5, for his 244th career victory, to set the record for most wins by a Latin American pitcher. Juan Marichal held the old mark. Chipper Jones backs Martínez' pitching with four hits and four RBIs. August 10 – At Qualcomm Stadium, the Wendelstedts become the first father and son duo to umpire in the same Major League game. Harry, umpiring in his final Major League season, serves as home plate umpire while his son Hunter, working in his first as a vacation substitute, serves as second base umpire in the Florida Marlins' 3–2 victory over the San Diego Padres. August 13 – Harold Baines of the Baltimore Orioles becomes the all–time leader in runs batted in by a designated hitter when he drives in his 824th career-RBI in a 7–4 win over the Cleveland Indians. Hal McRae was the previous record–holder. August 14 – Baltimore Orioles catcher Chris Hoiles becomes the ninth player — and first catcher — to hit two grand slams in a single game, doing so in a 15–3 win over the Cleveland Indians. August 23 : San Francisco Giants outfielder Barry Bonds hits his 400th career home run off Florida Marlins pitcher Kirt Ojala, a solo shot in the third inning of a 10–5 victory of the Giants at Pro Player Stadium. Andres Galarraga of the Atlanta Braves hits his 40th home run of the season, becoming the first player in history to hit 40 home runs in a season for two different teams in consecutive seasons (he hit 47 the previous season for the Colorado Rockies). August 25 – The Toronto Blue Jays' Roger Clemens strikes out 18 in a 3–0 victory over the Kansas City Royals. He becomes the first pitcher ever to record three games of 18 or more strikeouts. Clemens allows only three hits and does not walk a batter. August 31 – Oakland's Rickey Henderson scores the 2,000th run of his career in the Athletics' 15–6 loss to Cleveland. He joins Ty Cobb, Hank Aaron, Babe Ruth, Pete Rose and Willie Mays as the only players to reach the milestone. September September 1 – St. Louis Cardinals first baseman Mark McGwire hits his 56th and 57th home runs of the season, breaking the National League record of 56 homers set by Hack Wilson in 1930. September 4 –