If you weren't sold on Angelique Kerber's status as the best player in the land, look no further than what she has done so far at the WTA Finals.
- Kerber beats Halep for 2-0 start at WTA Finals
- Del Potro ends long drought with Stockholm win
- Gasquet beats Schwartzman to Antwerp title
- Carreno Busta rallies by Fognini for Kremlin Cup