NEW YORK: Nike co-founder Phil Knight is the richest man in American sport while Steve Ballmer of the NBA Los Angeles Clippers is the richest US sports team owner, Forbes magazine said on Tuesday (Wednesday in Manila). Knight with a worth of $24.4 billion ranks 17th overall in the Forbes 400, his worth jumping 23 percent from a year ago. Ballmer, the former Microsoft chairman ranked 21st wealthiest overall at $21.6 billion. The magazine’s annual list of the 400 Richest Americans included 39 people, nearly one in 10, who own a majority interest in a US sports league team. They own 47 clubs in all worth a combined $182 billion.