Croatian ninth seed Marin Cilic reached the Wimbledon quarter-finals for the third year running after Kei Nishikori quit with a rib injury midway through their fourth round match on Monday.
Making their first appearance in the WTA Finals in Singapore, Sania Mirza and Cara Black outplayed Raquel Kops-Jones and Abigail Spears in their opening match to book their semi-finals berth on Thursday.