6 prospects who could challenge Mets' Pete Alonso for NL Rookie of the YearRegardless of whether he's on Opening Day roster, Alonso should be in mix for award3/18/2019, 9:00 PMMar 13, 2019; Goodyear, AZ, USA; Milwaukee Brewers second baseman Keston Hiura (72) runs the bases after hitting a home run against the Cleveland Indians during the fifth inning at Goodyear Ballpark. Mandatory Credit: Joe Camporeale-USA TODAY Sports / Joe Camporeale