Caroline Wozniacki is the world's top-ranked women's tennis player and has been since October.
The Dane started to back up her claim as the best around by getting off to a fine start at the season's first Grand Slam event. Yesterday, she defeated Gisela Dulko 6-3, 6-4 in the first round of the Australian Open.
But just how deserving of the title of "Best in the World" is she?
Let's take a closer look: five reasons she is the best, five reasons someone else is.