(2) Roger Federer
- DOB: 08/08/1981
- Nationality: SUI
- Became Pro: 1998
- Height: 1.85
After winning the Australian Open title last year, the Swiss maestro did not reach the final at Roland Garros, Wimbledon or the US Open.
It marked a sharp downturn in Federer's form at the major tournaments as he had previously reached at least two - and usually three or four - finals per year since winning his first crown in Melbourne seven years ago.
His incredible run of 23 consecutive Grand Slam semi-finals was also ended by Robin Soderling in the last eight of the French Open, with Tomas Berdych eliminating him at the same stage at Wimbledon.
The 16-time Grand Slam winner fared better at the US Open, where he reached the semi-finals, but 2010 as a whole fell below Federer's usual standards.
However, he will take solace from the fact that he cruised to the Australian Open title last year, ending the hopes of Britain's Andy Murray in the process.
He is also a four-time champion in the event and will be keen to show the doubters that he still has plenty left to give at the age of 29.
Victory in Doha in the build-up, where the Swiss felt he played "near flawless" tennis, helped send out a message that he is still a man to be feared.
Ten-year Grand Slam History