Former champion Sloane Stephens believes there is more work to be done, after it was announced that the US Open would increase it's total prize money pool by 20%, starting at this year's edition in a few weeks.

The American defeated compatriot Madison Keys 6-3 6-0 to win her sole Grand Slam title at the 2017 US Open. Stephens had been sidelined for 11 months due to foot surgery and was unranked when she entered the tournament.

The victory catapulted Stephens from 975th in the world to World No.17, earning her the WTA Comeback Player of the Year. The Florida native would go to to reach a career-high ranking of World No.3, in addition to reaching the French Open final the following year.

However, Stephens has been battling several injuries over the last few years. The 32-year old has made

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