Jannik Sinner will become Italy's first men's tennis world number one after Novak Djokovic's injury-enforced withdrawal from the French Open on Tuesday.

The Australian Open champion was on court playing his quarter-final against Grigor Dimitrov when Djokovic's withdrawal was announced, meaning Sinner will replace the 24-time Grand Slam champion at the top of the ATP rankings next week.

Sinner already knew that he could secure number one by reaching the final at Roland Garros, but his landmark achievement was secured earlier than expected.

The 22-year-old has enjoyed a fine season, also winning the Rotterdam and Miami Open in addition to his maiden Grand Slam title in Melbourne.