Novak Djokovic beat Stefanos Tsitsipas 6-3 6-4 to win the Mutua Madrid Open men’s singles in Madrid, Spain.
Djokovic's 74th Tour title came after having made just one quarter-final in three tournaments since lifting the trophy at the Australian Open for the seventh time.
The Serbian, 31, who matched Nadal's record for Masters 1000 triumphs, will hold all four Grand Slam titles if he goes on to claim a second French Open title next month.
"This is a very important win for me, especially for my confidence," Djokovic told Sky Sports. "I wasn't playing my best tennis after the Australian Open so I was looking to regain momentum. I played some of my best tennis here."