Man City-bound Sullivan, 14, becomes youngest player in North American team sports history

Sullivan's Union contract has a clause that calls for a transfer to Manchester City once he turns 18.

Philadelphia Union midfielder Cavan Sullivan became the youngest player to debut in the MLS and North American team sports history when he came on in Wednesday night's match in the 85th minute against the New England Revolution.

Philadelphia native Sullivan (14 years, 293 days) passed Freddy Adu (14 years, 306 days) for the MLS mark. Adu set it for D.C. United in 2004.