Madison Keys outlasted Sloane Stephens while Belinda Bencic crashed out in Rome.
American stars Madison Keys, Serena Williams, Sloane Stephens and Amanda Anisimova are all in the same quarter of the draw.
The world No.126 is through to her second consecutive WTA quarter-final in as many weeks.
The opening day of the Mexican tournament was a roller-coaster encounter for two of the most well known players.
The world No.24 has said the ATP has 'got what they wanted' concerning the scheduling of the event.
The former world No.3 has insisted that there are 'two sides to every story' following criticism of her coach.
It was a day to forget for two of America's highest ranked women on Tuesday.
Sloane Stephens is looking to improve her fitness as she prepares for the US Open this week in Washington.
Johanna Konta raised her game at exactly the right time to overcome the stern challenge provided by Sloane Stephens at Wimbledon.
Ashleigh Barty and Sloane Stephens were among the early winners on day three of Wimbledon.
Sloane Stephens has remained positive despite being outclassed by Johanna Konta in her Roland Garros Quarter-Final
Kiki Bertens beat Sloane Stephens in straight sets at the Madrid Open to book her place in her third WTA Premier 5 final.
The world No.8 is hoping to find a boost in her form with the help of her new coach.
The American is bidding to win her first title in over a year this week.
Sloane Stephens lead the seeded exodus in the day session in Indian Wells as she crashed out to Stefanie Voegele.
As the second rounds approach in Indian Wells, here are five players that need a good tournament in California, which includes finalist Daria Kasatkina.
After a slow start that saw her lose eight consecutive games, Stephens battled back to reach the last stage of the WTA Finals on her debut.
Sloane Stephens won her third consecutive match at the 2018 WTA Finals to finish top of the group and qualify for the semi-finals.
Sloane Stephens produced a stirring fightback in the final set to gain a vital win over Kiki Bertens that edges her closer to the last four.
In the clash between the winners of the past two editions of the US Open Sloane Stephens started her WTA Finals campaign with a 7-5 4-6...