Big-hitting Jelena Ostapenko believes she could comfortably play five-set matches at the Grand Slams -- as long as they didn't stretch to epic proportions. Ostapenko was beaten in the Wimbledon semi-finals by Angelique Kerber 6-3, 6-3 on Thursday in a tie which was over in just 68 minutes.

Seven-time champion Serena Williams then needed only 70 minutes to get past Julia Goerges 6-2, 6-4 in a truncated Centre Court programme. On Wednesday, Rafael Nadal needed four hours and 48 minutes to see off Juan Martin del Potro in a five-set quarter-final. Roger Federer was defeated by Kevin Anderson, also in five sets, in four hours and 14 minutes.