Serena Williams heads into semifinals with comeback victory

The other semifinal will see No.11 seed Angelique Kerber of Germany take on No.12 seed Jelena Ostapenko of Latvia as they both bested their respective oppenents in straight sets.

With all top 10 seeds having been knocked out before the quarterfinals, 2016 runner-up Kerber is the highest-ranked player still in the ladies' competition.

In the men's singles, Juan Martin Del Potro finally defeated Gilles Simon 7-6, 7-6, 5-7, 7-6 after a total of 4 hours and 24 minutes, in a match that stretched over two days.

The Argentine will have to recuperate quickly, as his quarterfinal match against world No.1 Rafael Nadal is just around the corner.

Del Potro has never beat Nadal on grass and has lost 10 of their 15 encounters. Their match-up will take place on Wednesday on Centre Court after another quarterfinal tie between Novak Djokovic and Kei Nishikori.