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Muguruza had brought on Martinez to help her from Doha to Miami. The pair had first worked together at Wimbledon, where Muguruza won her second Grand Slam title.

Holding Serve - Garbine Muguruza:

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Martinez said it had been "great to work" with Muguruza, but the world No. 3 had decided to "go back to working with her full[-]time coach" following their collaboration.

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I want to share the news that my collaboration with Garbiñe has finished after Miami. She has decided to go back working full time with her coach. Like always it was great to work these past tournaments with her. I wish her and the rest of the team the best for the rest of year.
— Conchita Martínez (@conchitamartinz) March 28, 2018

Muguruza reached the Doha final and the semifinals of Dubai with the Spanish Grand Slam champion by her side. The pair was rejoined by Sumyk starting at Indian Wells, where Muguruza fell in the opening round and then reached the fourth round at Miami.

Muguruza is playing next week's WTA event at Monterrey.

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Garbine Muguruza wraps up coaching trial with Conchita Martinez

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