Novak Djokovic, the top men’s tennis player in the world, was detained by border authorities in Australia, on Saturday, the latest turn in a legal dispute over his travel visa that has drawn interest around the world and inflamed tensions during a rapidly spreading coronavirus outbreak. The Australian minister for immigration revoked Djokovic’s travel visa

Major League Baseball’s spring training is scheduled to start in a month and the 2022 regular season is supposed to kick off on March 31. Neither can happen until the owners of M.L.B.’s 30 teams and the players strike a new labor agreement, and with little progress so far, the clock is ticking on whether