Seattle Mariners rookie All-Star Julio Rodriguez joins Home Run Derby field 5:51 PM ET ESPN News Services Seattle Mariners rookie outfielder Julio Rodriguez will compete in the All-Star Home Run Derby at Dodger Stadium next Monday. Rodriguez will be the 14th rookie to participate, and only two of those have won outright: the New York Mets ' Pete Alonso in 2019 and New York Yankees ' Aaron Judge in 2017. Alonso is the two-time defending champion. Others to have entered this year's Derby are the Atlanta Braves ' Ronald Acuna Jr ., the St. Louis Cardinals Albert Pujols , Philadelphia Phillies ' Kyle Schwarber and Washington Nationals ' Juan Soto . Editor's Picks 1 Related Two spots remain to be filled for the eight-player field. Rodriguez announced his entry on social media. The 21-year-old leads major league rookies with 15 home runs entering Wednesday and is third with a .477 slugging percentage. That's after going homerless over his first 20 career games and recording his first career home run May 1. He is the seventh player in Mariners club history to participate in the Home Run Derby and the first since Robinson Cano in 2016. Hall of Famer Ken Griffey Jr. is the only Mariners player to ever win (three times: 1994, 1998 & 1999). Rodriguez, who is hitting .274 with 44 RBIs, 50 runs and 21 stolen bases, was announced as a member of the American League All-Star team on Sunday. He sat out the opener of Wednesday's day-night doubleheader in Washington as he served his one-game suspension stemming from his involvement in a brawl with the Los Angeles Angels on June 26. He is in the lineup for the second game. The Associated Press contributed to this report.