Argentina's Juan Martin del Potro reacts during his match against Belgium's David Goffin at Rome's ATP Tennis Open tournament at the Foro Italico, on May 17, 2018 in Rome. Pic/AFP

World No. 6 Juan Martin del Potro could be a doubt for Roland Garros after sustaining a groin strain in Rome. The Argentinian, a former US Open winner and Olympic silver medallist, retired from his third-round match against David Goffin at the Italian Open on Thursday.