Spain's Garbine Muguruza beat world number one Serena Williams in straight sets to win her first Grand Slam title at the French Open Fourth seed Muguruza won 7-5 6-4 to make amends for losing last year's Wimbledon final against Williams The 22-year-old is Spain's first female champion at Roland Garros since Arantxa Sanchez-Vicario in 1998