Halep lost in the fourth round of the U.S. Open this month. She missed the French Open, Wimbledon and the Tokyo Olympics after tearing her left calf at the Italian Open in May.
In Wednesday’s social media post, Halep wrote: “Thank you D for everything, for making me a better tennis player and a better person.”
Cahill responded on Twitter, writing, “no, thank you Simo for allowing me to take an incredible ride on your journey with you” and calling Halep a “great player but most importantly, a great person and friend.”
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