Mr Novak Djokovic, unfortunately, missed the Grand Slam of the Year. He had an opportunity to get it in 50 years since the previous time in 1969. I supposed he had a lot of pressure!
He is continuing to win 27 games in four major tournaments in 2021, then he lost the final game.
Incidentally, only two men have achieved the calendar-year Grand Slam.
There are only three women who have done so. Maureen Connolly (USA), Margaret Smith Court (Australia) and Steffi Graf (Germany) in 1988.
I believe Mr Novak Djokovic can do it next year.