Serena Williams offered no excuses after a straight-sets defeat to an "unbelievable" Garbine Muguruza in Saturday's French Open final.
Muguruza claimed her first Grand Slam victory with an impressive 7-5 6-4 victory on Court Philippe Chatrier. On Sunday, Novak Djokovic and Andy Murray played for the men's title.
MORE: Images from Roland Garros | Muguruza ascends in Paris
Williams failed to add to her 21 major titles since beating Muguruza at Wimbledon last year and remains behind Steffi Graf's Open-era record of 22.
In the past three majors, Williams lost in the U.