Former world number one Novak Djokovic has split from his coach Marian Vajda for a second time.
Serbia's Djokovic, 34, lost the number one ranking to Russian Daniil Medvedev on Monday.
The Serb, a 20-time Grand Slam winner, began working with Slovakian Vajda as a teenager in 2006 and the pair briefly split for one year in 2017.
"Marian has been by my side during the most important and memorable moments in my career," said Djokovic.
"Together we have achieved some incredible things and I am very grateful for his friendship and dedication over the last 15 years.