Former North Carolina Tar Heels pitcher Zac Gallen broke out last season with the Arizona Diamondbacks, putting together an impressive season in 2022. Despite the Diamondbacks struggles out West, Gallen is a bright spot on the roster. And he will get the Opening Day nod on Thursday. Gallen has been tabbed as the starter for the first game of the 2023 season as the Diamondbacks will head to Los Angeles to face the Dodgers. The pitcher is at the top of the team’s rotation along with Merrill Kelly who pitched for team USA in the World Baseball Classic. In 31…