Leading off the second inning, Orioles first baseman Chris Davis sent Yankees starter Hideki Kuroda's 2-1 pitch into the left field seats for his major league-leading 31st home run this season.
Davis broke former Orioles outfielder Brady Anderson's record for home runs in the first half of the season. Anderson hit 30 in the first half of the 1996 season on his way to an Orioles record 50.
After Sunday night, there are still 13 games until the All-Star break for Davis to extend the record.
The home run was Davis' third of the series against the Yankees after he went deep twice in the Orioles' 11-3 win Saturday. When his homer off Ivan Nova left Camden Yards in the sixth inning for his 30th, Davis became the first player in baseball history to have 30 home runs and 25 doubles by the end of June.
He also joined some elite company when he became the eighth player in baseball history to have 30 before the end of June. The other players on the list: Babe Ruth (1928, 1930), Ken Griffey Jr. (1994, 1998), Mark McGwire (1998), Sammy Sosa (1998, 1999), Luis Gonzalez (2001), Barry Bonds (2001) and Albert Pujols (2009).
The 31 home runs are also the most in Orioles history by the end of June. Anderson had 27 at the end of June 1996. Davis also entered Sunday on pace for 109 extra base hits. Anderson owns that club record with 92, also set in 1996.
Davis' home run Sunday, which gave the Orioles an early 2-1 lead, was his 12th home run of June. He became the first Oriole since Rafael Palmeiro in 1998 to hit at least hit nine home runs in three straight months.