The developments at Wimbledon on Wednesday included Novak Djokovic joining Roger Federer and Serena Williams as the only players in tennis history to win 350 Grand Slam matches; a runner-up two years ago, Karolina Pliskova, exiting in the first round against a qualifier; a player seeded No. 8, Maria Sakkari, taking the opening set 6-0 but managing to lose.