Olympic gold medal champion is fourth man to qualify for season-ending event in Turin.
US Open champion has signed on for the Mubadala World Tennis Championship this December.
The Czech is hoping a long off-season can help her get into top form next season, both mentally and physically.
The American, candid as ever, voiced some strong opinions in a recent interview with Inside Tennis.
The Pole came up with the idea during her third-round victory on Sunday.
Wimbledon finalist Matteo Berrettini shares the dream that fuels him.
The Scot used an old trick to wiggle out of a tough game with the Spaniard.
