BASTAD, Sweden — 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.