World No 6 Juan Martin del Potro could be a doubt for the French Open after sustaining a groin strain in Rome.
The Argentine, a former US Open winner and Olympic silver medallist, had to retire from his third-round match against David Goffin at the Italian Open on Thursday.
And Del Potro wrote on Twitter: "After the medical examinations it has been determined that I suffered a groin strain (grade 1) in Rome.
"I have started to do rehab and will evaluate the situation in the upcoming days, to decide whether I play the French Open."
The second major of the year runs from May 27 to June 10 at Roland Garros.
The 29-year-old is a former French Open semi-finalist, reaching the last four in 2009.
The 1000 Series continues with our coverage of the first ATP Rome Masters men's semi-final on Sky Sports Mix, channel 121, which is free for all Sky customers, from 1pm on Saturday. And the second semi-final will be shown live on Sky Sports Action from 7pm.
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