On this date, Aug. 10 (courtesy of the Charlotte Observer):
1957: Mickey Mantle became the first player to clear the center-field hedge at Baltimore's Memorial Stadium when his 460-foot homer hit the base of the scoreboard. The Yankees beat the Orioles, 6-3.
1971: Harmon Killebrew of the Minnesota Twins hit his 500th home run in the first inning off Baltimore's Mike Cuellar to become the 10th player to hit 500 or more. Killebrew also hit No. 501 off Cuellar, but the Orioles won 4-3.
A current Oriole making history (courtesy of ESPN.com):
Miguel Tejada hit his 20th home run of the season in the Orioles' win in Toronto. It's the eighth consecutive season in which Tejada has hit at least 20 home runs. Only two other players in major league history had eight consecutive seasons of 20-or-more home runs and 100-or-more games at shortstop: Cal Ripken (nine straight seasons, 1983-1991) and Alex Rodriguez (eight, 1996-2003). Ernie Banks did it seven consecutive years (1955-1961).