USC hopes the hire will result in a return to national prominence for the football program. Riley, 38, is considered to be one of the best coaches in college football.
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"This was the right time. Everything about it made sense ... I love the situation we're in right now," Riley said at the press conference.
Riley left Oklahoma for the Trojans. Riley went 55-10 in five seasons leading the Sooners, winning four Big 12 titles and making three College Football Playoff appearances in his first head coaching job.
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