Coco Gauff, Iga Swiatek, Linda Noskova and Leylah Fernandez all exited the Stuttgart Open at the quarter-final stage, missing out on a decent haul of ranking points.
Iga Swiatek has denounced the intense Polish media following her decision to split from coach Wim Fissette and replace him with new man Francisco Roig.
WTA superstar Iga Swiatek looks set to welcome a coach who was on Rafael Nadal's coaching team.
Following a run of poor form, reigning Wimbledon champion Iga Swiatek revealed she has split with coach Wim Fissette.
Second seed Iga Swiatek suffered a historic loss to Magda Linette in the opening round of the Miami Open on Thursday night.
World number four Coco Gauff was forced to retire from her third-round match at the Indian Wells Open on Sunday after suffering what she described as a "scary" injury to her left arm.