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Juan Martin announced the end of his working relationship with Sebastian Prieto via social media.

Del Potro Announces Split With Prieto

Argentine reached career-high FedEx ATP Ranking of No. 3 during partnership

When play resumes on Tour, 2009 US Open champion Juan Martin del Potro will have a new coach working alongside him. The Argentine confirmed on Saturday that he parted ways with coach Sebastian Prieto, whom he has worked with since August 2017.

Prieto will switch to coaching fellow Argentine Juan Ignacio Londero. The former ATP Tour player picked up 10 tour-level doubles titles during his career and peaked at No. 22 in the FedEx ATP Doubles Rankings in 2006.

“I want to share that I have agreed with Sebastian Prieto to end our partnership, so that he can work with Juan Londero, while I continue my rehab process,” Del Potro wrote. “I’m very thankful to Piper for all of these years together. He is a great coach and an even better person. All the best!”

Del Potro has not yet confirmed who will replace him. Prieto helped the baseliner achieve several career highlights in 2018, including his first ATP Masters 1000 title at the BNP Paribas Open, first Grand Slam final in nine years at the US Open and reaching a career-high FedEx ATP Ranking of No. 3 that August.

The 31-year-old Del Potro has not competed since last June after undergoing surgery to repair a fractured right kneecap he sustained that month at the Fever-Tree Championships. He previously broke his patella in October 2018 at the Rolex Shanghai Masters, causing him to miss the last four weeks of that season and limiting him to five tournaments in 2019.