When Matt Serra returned to the welterweight division in 2005, the weight class was dominated by Matt Hughes . Hughes had just defeated Georges St-Pierre to win back the title after losing it to B.J. Penn . Prior to the Hughes and St-Pierre rematch at UFC 65, Serra was on The Ultimate Fighter 4 as a welterweight contestant. St-Pierre was a coach during the season and Hughes appeared as a guest coach. Serra and Hughes would go on to have an intense rivalry that began during the filming of TUF 4.
See the original post:
Matt Serra explains how Matt Hughes rivalry began because of Georges St-Pierre – MMA Weekly