The 22-year-old Fernández is batting .284 with 13 homers and 39 RBIs in 64 games for Albuquerque this season. The Rockies signed him for $295,000 as an international free agent out of Cuba in 2019, when he was 16. His major league debut will have to wait until Wednesday at the earliest. The left-handed batter did not play in Tuesday night’s 6-5 loss to the Houston Astros, who started lefty Colton Gordon.