(3) Serena Williams
There is simply no stopping Serena at the moment and she once again heads into a Grand Slam as the woman to both beat and fear.
The resurgent American is in the midst of a blistering run, which began at her second home of Wimbledon back in June.
She landed a fifth title at the All England Club, struck gold at the same venue in the London Olympics and rounded off the season with US Open and WTA Championships glory.
Serena shows no signs of slowing down, either, and made an immediate statement at the start of the 2013 season with WTA title joy at the Brisbane International - the 47th of her glittering career.
The 31-year-old American powerhouse dropped just 17 games during the Queensland hardcourt event and needed only 51 minutes to dispose of Russian Anastasia Pavlyuchenkova in the final.
Williams has won 36 of her last 37 matches at the time of writing.
If a sixth Australian Open title were not enough motivation for the Michigan-born star, a return to the summit of the WTA rankings surely will be.