Defending champion Novak Djokovic has withdrawn from the Paris Masters. The 37-year-old Djokovic played at the Six Kings Slam exhibition last week and organizers did not give a reason for his withdrawal.

Djokovic won last year’s event in Paris by beating Dimitrov in the final and at the ATP Tour Finals, he beat Sinner in the final. That was the last time he defeated the current world No. 1, who has won all three of their meetings since.

One of the Big Three of Novak Djokovic, Rafael Nadal and Roger Federer have won at least one ATP Masters 1000 title every year since 2004.