“What a journey Marian. 15 years! 🤯😃,” Djokovic wrote on Twitter. “You have been by my side during the most important & memorable moments. We have achieved the unachievable & I will forever be grateful for your friendship & dedication.

“You will always be my family & I can’t thank you enough for everything 🙏🏻”

Outside of a short period nearly five years ago, Vajda had worked with Djokovic since 2006. The Slovakian won the 2018 ATP Coach of the Year in the ATP Awards (the award was created in 2016). According to Team Djokovic, Goran Ivanisevic remains Novak’s coach.

Djokovic began his season at the Dubai Duty Free Tennis Championships, where Jiri Vesely upset him in the quarter-finals. On Monday, Daniil Medvedev passed the Serbian for the No. 1 ATP Ranking.