Roger Federer eyes number one spot

Roger Federer has entered thequarter-final after defeatingGermany's Philipp Kohlschreiber in the last 16 on Thursday - winning 7-6(8), 7-5 in an hour and 42 minutes.

The former number one will faceDutchman Robin Haaseat the ABN Amro World Tennis Tournament in Rotterdam.

If he wins then he will become the oldest player ever to be ranked world number one.

The 36-year-old Swiss will overtake Rafael Nadal at the top if he beats Robin Haase in the last eight.

But the reigning Wimbledon and Australian Open champion to regain the world rank one.

The Swiss is excited about the possibility of returning to the top of the rankings 19 years after he played Rotterdam in 1999 on his first career wild card.

"I never imagined this after my (February 2016) knee surgery. Number one is a tough place to get to.

"The most important thing is to be healthy, I would have had great regrets if I had not come here this week. I'm very excited for tomorrow's match, I can't wait for it to come around, Federersaid in an interview."