This week, the top players in tennis are back into the grind, although an enviable one, of the ATP Tour and WTA Tour schedules. They should be well-rested, after the better part of two much-needed months of no pressure to perform or maintain rankings. The WTA top-100 rankings don't change at all between early December and the end of the year, and the ATP top-100 saw only inconsequential tweaks in a few point totals before year's end. For most of the top players, coming from parts of the world where early January is cold, the warm, sunny climates of the year's first tournaments must add to the appeal of getting back into competition. Off to great starts with the first singles titles of 2013 are Andy Murray and Serena Williams in Brisbane, Australia; Richard Gasquet in Doha, Quatar; Li Na in Shenzhen, China; Janko Tipsarevic in Chennai, India; and Agnieszka Radwanska in Auckland, New Zealand.