Interesting matches made up the fourth round of this year's Wimbledon on Monday, with the Williams sisters taking on each other and World No. 1 Novak Djokovic in action against No. 14 Kevin Anderson.

After facing her first real test in the tournament in the third round Friday against Britain's Heather Watson, Serena took on arguably her biggest adversary - older sister Venus, who has been consistent, although unforced errors have caused her problems.

The encounter took place on the Centre Court with No. 2 Roger Federer and No. 3 Andy Murray also competing on Monday.

Murray defeated Croatia's Ivo Karlovic and Federer won through against No. 20 Roberto Bautista Agut.

Serena Williams managed to claim the win against older sister Venus in another massively competitive game between the pair. However, the younger sister seemed to have more energy on court and overpowered her sibling.

Serena has been in amazing form over the past 12 months and is looking for yet another Grand Slam and yet another Wimbledon title.

In the last round she was just points away from being knocked out in what would have been a massive shock by Britain's Heather Watson. However, she dug deep - as she has done so many times before - and she eventually managed to sneak through to show why she's such a champion.

For other match schedules and fixtures for the Fourth Round of Wimbledon click here.