Petra Kvitova's six career grass-court titles are most of any active woman.
Paula Badosa, who suffered a fractured vertebrae in her back earlier this season, retired from her singles match and withdrew from mixed doubles.
Andy Murray and Stefanos Tsitsipas will have to resume their anticipated second round match tomorrow.
"I love to watch [Novak] play, as much as I was loving to watch Roger play," Stan Wawrinka said.
Victoria Azarenka has adapted a different mind-set for lawn tennis.
The American is in the groove, and into Wimbledon's third round for the first time.
Roger Federer has one main wish for Rafa Nadal.
