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Marin Cilic has added Wayne Ferreira to his coaching staff for the grass-court season. Ferreira, who retired in 2005, reached reached a career high ranking of No. 6 and won 15 ATP Tour titles.

Cilic announced his newest coaching addition via Twitter on Sunday.

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The 2014 US Open champion is coming off a slow clay-court season, having lost early in Monte Carlo, Budapest, Rome, and a tough second-round five-setter against Grigor Dimitrov at the French Open. The 30-year-old Croatian is set to defend his Fever-Tree trophy at the Queens Club this week.