London:
The tournament, a warm-up event for Wimbledon, starts on Monday.
The No.9-ranked del Potro appeared to have been hampered by a left knee injury during his French Open quarterfinal defeat to Roger Federer on Tuesday.
The Argentine's left knee was heavily wrapped in white tape during the match but he refused to blame the injury for his Roland Garros exit.
Topics mentioned in this article
Tennis
Rafael Nadal
Andy Murray
Novak Djokovic
Juan Martin del Potro
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