Rafael Nadal
In 2009, the 22-year-old will attempt to become the first left-hander to finish back-to-back years as ATP World Tour Champion since John McEnroe was No. 1 for four straight years from 1981-84. The Mallorca native led the ATP World Tour in 2008 with the most titles (8), match wins (82) and prize money ($6,773,773).

Nestor/Zimonjic
The veteran squad of Canadian Daniel Nestor and Serbian Nenad Zimonjic finished No. 1 for the first time in the ATP Doubles Team Rankings in 2008. The duo won five titles together, including their first Wimbledon crown. In December, both players became fathers for the first time, 12 days apart.