Alonso watches the flight of his 53rd and final home run of the 2019 season.
When he slugged his 53rd home run of the season on September 29, the final game of the 2019 season, Pete Alonso set a major league record for most home runs hit by a rookie. The previous mark was set in 2017 when the Yankees’ Aaron Judge slugged 52 homers. Alonso’s 53 round-trippers led the majors.