Has Garrett Whitlock emerged as Boston Red Sox's top starting pitching prospect? 'I think as he continues to pitch, (his slider) will be a major player for him'

Rule 5 Draft pick Garrett Whitlock finally allowed his first run as a major leaguer Sunday, but he had his best fastball velocity this season. He threw 12 two-seam fastballs, averaging 97.4 mph and topping out at 98.1 mph, per Baseball Savant. The Red Sox rookie has allowed just one...