38-year-old Novak Djokovic says he has a ‘half tank empty’ in late stages of Grand Slams

At 38 years old, Novak Djokovic is in the final stages of his career as the GOAT of men’s tennis.

Still, he has advanced to the semifinals of all three Grand Slams this season and is now one victory away from reaching a fourth. The Serbian legend stands three wins away from a record 25th Grand Slam title.