this spring in the finals of Indian Wells and Miami.

Djokovic, now 37-0, has won seven total ATP Tour singles titles for the year. This week Djokovic remains ranked number two behind Nadal due to the ATP Tour’s rankings’ consideration of the entire previous 52 weeks played; not only tournaments from this year.

Nadal is the defending champion at the French Open, Wimbledon and the US Open. But with Djokovic’s dramatically improved form of this year, it will likely be difficult for Nadal to repeat at all three remaining grand slams this year. That would lead to most likely Djokovic topping the ATP Tour rankings at some point during this summer.

However in early 2012, Djokovic could feel pressured to defend the great amount of rankings points he is amassing during his current winning streak.

With her first title win of the year, Maria Sharapova rose one place from eight to seven in this week’s WTA Tour singles’ rankings. Sharapova outhit the sixth seeded Samantha Stosur of Australia 6-2, 6-4.

Saturday in her road towards the final round, the Russian also upset the world number one Caroline Wozniacki of Denmark 7-5, 6-3.

Sharapova won Wimbledon in 2004, the US Open in 2006 and the Australian Open in 2008. In 2007, Sharapova lost to Ana Ivanovic of Serbia 6-2, 6-1 in the semifinals for her best ever French Open finish.