Serena Williams of the United States, left and Garbine Muguruza of Spain hold up their trophies after the women's singles final against at the All England Lawn Tennis Championships in Wimbledon, London, Saturday July 11, 2015 (Photo: AP)
Wimbledon champion Serena Williams has pulled out of the Swedish Open, citing a right elbow injury.
Tournament spokesman Marcus Duner says the top-ranked Williams was injured while practicing Thursday. He had no immediate details on the injury.
Williams withdrew ahead of her second-round match against Klara Koukalova, who advanced to the quarterfinals by walkover.
Williams sailed through her opening match on Wednesday with a 6-2, 6-1 win over Belgian qualifier Ysaline Bonaventure, four days after winning her sixth Wimbledon title and fourth Grand Slam in a row.
Duner says organizers are ''obviously sad when the world's No. 1 can't continue to play'' but there are still good players left in the draw.
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