 Pete Alonzo will participate in his fifth straight home run derby with the New York Mets first baseman trying to win for the third time. Baltimore's Gunnar Henderson and Philadelphia's Alec Boehm also have committed to the July 15th event at Globe Life Field in Arlington, Texas. Alonzo made the announcement last night on Instagram. Ken Griffey Jr. is the only three-time champion of the derby, which started in 1985, winning in 1994, 1998, and 1999.