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Sloane Stephens
Sloan Stephens is the 2017 US Open champion and she also reached the final of the French Open. However, she hasn't had much success on grass; her best showing is a quarter-final appearance in 2013.
That said, Stephens hadn't had much success at any Slam before last year. She has been steadily improving since returning from foot surgery in January 2017, and can be considered a credible contender.
Madison Keys and CoCo Vandeweghe
Americans Madison Keys and Coco Vandeweghe have achieved a fair amount of success at Wimbledon. Keys reached the quarterfinal in 2015 while Vandeweghe reached there twice - in 2015 and 2017.
They have both shown rapid improvement in their games over the last couple of years and could do plenty of damage this year with their big serves and forehands.
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