Five-Star RB Ty Isaac Commits to USC

Under Pete Carroll, USC had a stable of running backs. Such a large stable, that playing time often became hard to come by.

Thanks to Joliet Catholic's Ty Isaac, the Trojans might also have that problem under Lane Kiffin. Isaac, a running back from Joliet, Illinois, spurned the Big Ten, a late push from Notre Dame and possibly promises of a car, signing his National Letter of Intent to play for the Trojans Wednesday morning.

The 6-foot-3, 215-pounder has great size, but he's a five-star prospect (according to Rivals and Scout) because he also has breakaway speed. Isaac originally planned to enrollee early, but that plan fell through do to complications at his high school.

On the field, he didn't have many complications as he dominated the Illinois competition, particularly his junior season when he rushed for 2,629 yards and 51 touchdowns, including a 515-yard, six-touchdown game in the state final. This season, he was slowed by shoulder and groin injuries. He put up strong performances when in the lineup, such as the 277 yards and three touchdowns in his final playoff game in the state semifinals.

Could Isaac make an immediate impact? Running back is a position that really needs the extra time during spring practice that enrolling early provides for that to happen. The added complexity of college blocking schemes tend to slow freshman and keep them off the field early.

Isaac also enters a crowded backfield where he will be begin behind experienced backs Silas Redd and DJ Morgan as well as Javorius Allen and last spring's breakout player Tre Madden, who is returning from a torn ACL that caused him to miss the entire 2012 season. Early enrollee Justin Davis will also be battling for playing time.

Isaac is rated highest by Rivals, who has him as the No. 4 running back and the No. 27 player overall. Scout has him at No. 7 at his position and No. 37 overall. ESPN lists him as a four-star back -- 13th best in the country and No. 122 in the ESPN150.

Here's some of Isaac's highlights from this past season

For more information on high school recruits potentially choosing USC, follow our National Signing Day coverage.