French Open champion Garbine Muguruza retired with a left Achilles injury and US Open finalist Karolina Pliskova was knocked out in the second round at the Dubai Tennis Championships on Tuesday.
The seventh-ranked Muguruza drew the trainer on court when trailing Kateryna Bondarenko of Ukraine 3-0, and quit at 4-1 down.
Second-seeded Pliskova was upset by Kristina Mladenovic of France 6-2, 6-4. Pliskova won her second title of the year in Doha last weekend, defeating former No. 1 Caroline Wozniacki in the final.
After a first-round bye in Dubai, she struggled with her serve, double-faulting six times and losing her serve four times to Mladenovic.
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