Australian Open champion Stanislas Wawrinka has pulled out of next week's Rotterdam tournament with a leg injury, while defending champion Juan Martin del Potro is questionable with a wrist injury.
"Unfortunately I'm not in the form to compete in Rotterdam," said Wawrinka, who won a Davis Cup match last Friday against host Serbia. "I hope to be back on court very quickly.”
Del Potro, who has been dealing with wrist problems for years, recently visited the Mayo Clinic in Minnesota to have his sore left wrist treated. The world No. 4 had surgery on his right wrist in 2010.