Wimbledon runner-up Eugenie Bouchard of Canada withdrew Thursday from the Citi Open next week.
Tournament officials didn't provide a reason for Bouchard's decision to pull out of the Washington event.
The Westmount resident hasn't played on tour since losing to Petra Kvitova in the final at Wimbledon on July 5.
Ranked No. 7 in the world, the 20-year-old has made three previous appearances in the Washington event.
Wimbledon semifinalist Lucie Safarova will replace Bouchard as the Citi Open's top seed.
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