Britain's Kyle Edmund secured one of the biggest triumphs of his career by defeating former world No.1 Novak Djokovic 6-3 2-6 6-3 in the second round of the Madrid Open.
Djokovic, a two-time champion in the Spanish capital, has not won a deciding set this year and, having previously suffered final set losses to Martin Klizan, Dominic Thiem and Taro Daniel, the 30-year-old Serb's disappointing run continued.
Australian Open semi-finalist Edmund claimed the decisive break in the eighth game of the decider before coolly closing out his service game to love for his 14th match win of the year
"It was a great experience to beat Novak; I've lost to him three times," Edmund said.
"He's a legend of the game so your first match when you share the court is an experience, but now, especially after reaching the semis of the Australian Open, it's time to try and beat these guys."
It is the sixth straight tournament in which Djokovic has failed to reach the quarterfinals.
"There are obvious things that are not working well for me," Djokovic said.
"But I have to keep working on them and pray that ... and hope that my game will get stronger."
Edmund, the world No.22, will face eighth-seeded Belgian David Goffin in the third round.
In contrast to Djokovic world No.1 Rafael Nadal recorded his 20th straight win on clay as he began his quest for a sixth title in Madrid, defeating Frenchman Gael Monfils 6-3 6-1.
Nadal, who received a bye in the opening round, fired 17 winners and went on to lose just one of 13 service points in the second set to seal victory.
The 31-year-old Spaniard has now won 48 consecutive sets on the surface, two sets shy of breaking American John McEnroe's record of 49 straight sets on a single surface in 1984.
The start of the clay-court season has been almost perfect for me," said Nadal, who extended his winning run on the surface to 20 matches.
Germany's Philipp Kohlschreiber beat Spain's Roberto Bautista Agut 6-3 4-6 7-5 in two hours and 32 minutes and now plays South Africa's Kevin Anderson, who defeated Kazakhstan's Mikhail Kukushkin, 5-7 7-6 (7-3) 6-2.
World No.7 Dominic Thiem joined Anderson, Nadal and Edmund in the last-16 but home favourite Feliciano Lopez, who will become tournament director next year, was beaten by Argentine Diego Schwartzman.
Alexander Zverev also advanced, beating Evgeny Donskoy 6-2 7-5.