Twice defending champion Venus Williams moved closer to a Wimbledon title hat-trick on Monday when fourth-round rival Ana Ivanovic left in tears after quitting their Court One match through injury. Serbia’s former world number one lost the first set 6-1 against third-seeded American rival Williams and was serving in the first game of the second when she was forced to stop because of a thigh problem. Thirteenth-seed Ivanovic returned to court after treatment to win the game, but then quit the match — handing Williams a place in the last eight in a highly-emotional moment.