They're supposed to be the Yankees' two best prospects, but Manny Banuelos and Dellin Betances haven't pitched like it yet this year.

Banuelos, 21, was pulled from his Triple-A start today after just two innings, having walked six batters and thrown 74 pitches. He left after surrendering two runs and three hits with no strikeouts. The six walks matched the total yesterday for the 24-year-old Betances, who left after allowing eight runs in 3 1/3 innings.

It's only been a couple of starts for each of them—Betances has allowed 10 runs and seven walks in 8 1/3 innings, Banuelos six runs and seven walks in 5 1/3 innings—but the results haven't been what the Yankees were hoping for from their top two arms.

The reports on Banuelos' stuff this year have still been positive, with a lively low-90s fastball and two crisp offspeed pitches, but some scouts have expressed concern about his lack of control. Banuelos stood out for his control up through high Class A Tampa back in 2010, but since then he's had some battles with the strike zone, which is all the more puzzling given his easy, repeatable delivery and his track record. Betances, of course, has never been known for his command and has been prone to overthrowing, but he's been able to miss bats and overpower hitters with success up through Double-A last year.

Obviously there's no reason to get too worked up over a handful of April starts, but scouts are keeping an eye on how often these two find the strike zone in 2012.