I've written once before about previously unknown prospect, DLS. Thanks to his 7 innings of no-hit work last night, we've got some more info in the form of a milb.com scouting report.
De Los Santos' fastball averages between 91-94 mph, and he often maintains that speed late in games. Owens said the 21-year-old right-hander, who throws a sinking fastball and slurve and is working on a changeup, averaged 94 throughout his final frame Tuesday.
In addition to the MILB report, a poster at Soxtalk claims that DLS was touching 96 in the 7th.
With those scouting reports, DLS currently has the highest ceiling of any pitching prospect not named Gio in our system.