Naomi Osaka has pulled out of the upcoming bett1open in Berlin, the first of two Wimbledon warmup events on grass, according to the Women's Tennis Association.
The world's top three — Poland's Iga Swiatek, Anett Kontaveit of Estonia and Spaniard Paula Badosa, respectively — will also miss the WTA 500 tournament opening next week at LTTC Rot-Weiss, the WTA said in a statement on its website.
Former world No. 1 Osaka made a first-round exit from the French Open last month, losing 7-5, 6-4 to American Amanda Anisimova after playing with pain in her left Achilles tendon.
The 24-year-old winner of four Grand Slam singles titles is currently ranked No. 43 in the world.