Laura Robson presents coverage of the opening play on day seven of the Grand Slam tournament from the All England Club, where the fourth round is scheduled to get under way in the men's and ladies' singles competitions. Seventeenth seed Karen Khachanov was the first player to secure a place in the quarter-finals last year, overcoming Kamil Majchrzak 6-4, 6-2, 6-3. He was followed onto the No 2 Court by Laura Siegemund, who was equally comfortable in a 6-3, 6-2 victory over Solana Sierra