CELEBRITY FRIDAY: Novak Djokovic Engaged To Jelena Ristic

Current World #1 Novak Djokovic, 26, who this week became the 9th player in history to reach 100 weeks at the top of the ATP tour, announced his engagement to longtime girlfriend, Jelena Ristic, via twitter earlier this week.

Ristic, 27, now runs Djokovic's charitable foundation and is often seen in his player's box, cheering on her man to victory. With Djokovic's announcement and Murray's multiple public appearances with model gielfriend Kim Sears, will Rafael Nadal's girlfriend (Francisca "Xisca" Perelllo) get a higher profile?

Roger Federer, 32, is roughly five years older than his higher ranked rivals and has been married to Mirka Vavrinek for over 4 years and is now the father of three-year old twin girls Charlene and Myla.