"He's not flying under our radar at all," Balsley said.
Vincent entered Wednesday's game against the Brewers with a 1.37 ERA in 19 2/3 innings this season. Combine that with his 1.71 ERA in 26 1/3 innings last season, and only Braves reliever Craig Kimbrel has a lower ERA (1.17).
"He has got a legitimate Major League pitch in his cutter, and he's at the point where we can trust him," Balsley said. "His cutter is good. His challenge now is when and if he needs to use his other pitches."
Vincent has allowed runs in just two of his 18 appearances since being recalled from Triple-A Tucson on June 11.
Balsley said Vincent's cut-fastball might look like a slider to some because of its lateral movement, but it is, indeed, a cutter.
Vincent has been sidelined by injuries in Spring Training in each of the last two seasons, which has slowed his progress and kept him from joining the Padres until midseason. In 2012, he severely sprained his left ankle stepping on a ball. This spring, he sustained inflamed tendons in his right forearm.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.