CHESTER, Pa. (AP) — Philadelphia Union midfielder Cavan Sullivan became the youngest player in Major League Soccer history when he made his debut against the New England Revolution. At 14 years and 293 days old, Sullivan is about two weeks younger than Freddy Adu was when he made his MLS debut in 2004. Sullivan is also younger than any player who has appeared in any of the four major North American sports since at least 1970. According to the Elias Sports Bureau, that mark is held by Andrew Bynum. He debuted for the Los Angeles Lakers in 2005 at the age of 18 years, 6 days.