By HOWARD FENDRICH
AP Tennis Writer
WIMBLEDON, England (AP) — Reigning Wimbledon champion Novak Djokovic might be playing in his last Grand Slam tournament for a while because he isn’t vaccinated against COVID-19. And the coronavirus has become a significant matter at the All England Club: Three of the top 20 seeded men in the tournament have pulled out of the bracket after testing positive. Players aren’t required to get tested for COVID-19 but are encouraged to if they develop symptoms. They also are encouraged to let Wimbledon know if that happens and pull themselves out of the tournament. No. 8 Matteo Berrettini, No. 14 Marin Cilic and No. 17 Roberto Bautista Agut have done that so far.