The 53-year-old Australian helped Romanian star Halep to a maiden Grand Slam triumph at Roland Garros in June as well as a year-ending world top spot ro crown their four-year partnership. He had previously coached Lleyton Hewitt and Andre Agassi.
"I'd like to thank Simona for the last 4 amazing years. Her understanding, personality, work ethic, generosity and professionalism made it a pleasure to stand by her side as her coach. Basically, I had the dream job." Halep, 27, thanked Cahill for his work.
"Thank you so much @darren_cahill for all your hard work and incredible support over the past four years," she tweeted. "I was lucky to have you and what a journey we had.
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