With Novak Djokovic back in his native Serbia, unable to compete in the Australian Open because he is not vaccinated against the coronavirus, a big question mark looms over what comes next for the world’s top male tennis player.
The French authorities said this week that players must be vaccinated to compete in the French Open — the next of the four Grand Slam tournaments, scheduled for May.
If Mr. Djokovic refuses to get vaccinated, he is likely to miss a second major tournament in a row, reflecting a major shift in how public officials approach Covid requirements and potential exemptions.