Williams sisters look to turn back clock in quarters

Serena Williams of the U.S. reacts after winning a point against Garbine Muguruza of Spain during their women's singles fourth round match at the Australian Open 2015 tennis tournament in Melbourne January 26, 2015. REUTERS/Athit Perawongmetha

MELBOURNE (Reuters) - Serena and Venus Williams will be looking to turn back the clock almost six years when they play their quarter-finals at the Australian Open on Wednesday.

The American sisters face the possibility of meeting each other in a grand slam for the first time since the 2009 Wimbledon final if they can first overcome tricky opponents on Rod Laver Arena, with Venus having the toughest challenge.