Maria Sharapova hit back at Serena Williams’s accusations that the Russian’s autobiography was “100 percent hearsay”, insisting Wednesday that controversial references to her arch-rival are accurate. “When you’re writing an autobiography, I don’t think there is any reason to write anything that’s not true,” said Sharapova after being knocked out of Roland Garros by Garbine Muguruza 6-2, 6-1 in the quarter-finals. Sharapova and Williams were due to clash in the fourth round on Monday but the American pulled out at the last minute of their eagerly-awaited grudge match with injury.