LONDON (Reuters) - Four-times champion Serena Williams withstood a stiff test from 'golden-set' challenger Yaroslava Shvedova to reach the Wimbledon quarter-finals with a 6-1 2-6 7-5 win on Monday.

Kazakhstan's Shvedova, who became the first player to win a set at a grand slam without dropping a point in the previous round, troubled the American on a soggy day at the All England Club but did not have the firepower to cross the finishing line.

Williams, the sixth seed, completed the win in just under two hours with a blazing backhand that had Shvedova lunging in vain.

The 13-times grand slam champion will next face either holder Petra Kvitova or Italy's Francesca Schiavone.

(Editing by Pritha Sarkar)