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Nitto ATP Finals: Holger Rune will be credited with his first win in the Green Group after Stefanos Tsitsipas was forced to retire due to a medical reason after just three games of their Nitto ATP Finals round-robin match Tuesday afternoon.

The 20-year-old Dane lost his first match on debut against Novak Djokovic but is now 1-1 in Green Group play after the Greek was forced to retire after just 15 minutes inside the Pala Alpitour with Rune leading 2-1.

Earlier this year Rune reached quarter-finals at Roland Garros and Wimbledon and won the title in Munich. He will face Jannik Sinner in his final round-robin match on Thursday. The Italian Sinner plays Djokovic on Tuesday evening.