Nike has been known to make custom typefaces for a lot of their sports team work. It's possible it's just a generic sports font though. I don't have any off the top of my head but here's a closer look at the type for anyone wanting to ID it.

Can't state if it's a Nike proprietary typeface but Eriq Jaffe has digitized many US sports team apparel fonts that match this design: MLB Angels, MLB Block, MLB Blue Jays, MLB Cubs, MLB Mariners...