The 24-year old righty was signed out of the Dominican Republic, and briefly left for the Padres organization when they selected him in the rule 5 draft in 2009; he pitched poorly in spring training and was returned to the Yankees. He added some velocity last year, and was called up to the Yankees and pitched decent in 42 innings (4.50 ERA, 1.48 WHIP).
Nova used to throw 90-91 mph, but he's added velocity and now is 92-94, but can touch 97. He has a high effort delivery which is very deceptive the first time through the order, but hitters adjust the 2nd time around. He also throws a curve and a change-up, but neither pitch is average at this point.
So far this year he's made 8 starts, and is 4-3 with a 4.33 ERA, and 1.51 WHIP. His K/9 is way to low to survive in the majors, let alone the AL East, 4.95, and his BB/9 is too high as well, > 4.
His ceiling is a back of a rotation starter, and many think he may wind up in the bullpen for shorter outings.