British number one Kyle Edmund produced a magnificent display to defeat 12-time Grand Slam champion Novak Djokovic at the Madrid Masters.
In his best display since reaching the Australian Open semi-finals in January, Edmund weathered a mid-match resurgence from the Serb to come through 6-3 2-6 6-3 and move to within touching distance of the world's top 20.
The 23-year-old will face David Goffin in the third round and, remarkably, would move above Djokovic in the ATP world rankings with victory.
The result is a massive boost for British tennis after reports circulated late on Tuesday suggesting Andy MurrayвЂ™s comeback from a hip injury had stalled, while womenвЂ™s number one Johanna Konta continues to struggle for form after her stellar run to the Wimbledon last four in 2017.
Edmund appeared to be running out of steam in the final set after falling to 0-40 at 2-2, but his first serve hauled him out of trouble as he reeled off five straight points.
Djokovic impressed at points too, showing few signs of the elbow issue that had plagued his last 24 months, but his normally rock-solid defence could not keep EdmundвЂ™s punishing attack at bay.
And the pressure told in the ninth game of the decider, when Edmund took his solitary opportunity on his opponentвЂ™s serve before seeing out the match with unnerving aplomb.
"It was a great experience to beat Novak, he is a legend of the game," Edmund told Sky Sports. "It's time to try and beat these guys and I was pleased how I managed my game."
Djokovic, who has been hampered by a long-term elbow injury, has not reached the last eight of a tournament since last year's Wimbledon.
He has struggled on his return to clay ahead of the French Open, having suffered early exits in Monte Carlo and Barcelona last month.
"Look, there are obvious things that are not working well for me," the 12-times grand slam champion said.
"But I have to keep working on them and pray that -- and hope that my game will get stronger, get better as definitely as the matches... go the distance."
World number one Rafa 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.
Third seed Alexander Zverev bowed out at the Cincinnati Open after a three-set defeat to Dutchman Robin Haase.
Ukraine's Lesia Tsurenko stunned defending Cincinnati Masters champion Garbine Muguruza with a 2-6 6-4 6-4 second-round win over the seventh-seeded Spaniard.
Federer advanced to the third round with a 6-4, 6-4 victory against Peter Gojowczyk, and Williams was eliminated by eighth-seeded Petra Kvitova in a 6-3, 2-6, 6-3 second-round loss.
Serena Williams was eliminated from the Western & Southern Open on Tuesday, falling to eighth-seeded Petra Kvitova in a 6-3, 2-6, 6-3 second-round loss.
Novak Djokovic overcame home favourite Steve Johnson, Stan Wawrinka beat Diego Schwartzman and Andy Murray was eliminated in the first round of the Western & Southern Open in Cincinnati.
Andy Murray lost to Lucas Pouille 6-1, 1-6, 6-4 in the first round of the Western & Southern Open on Monday, clearing another obstacle for Roger Federer in this US Open tune-up.
Serena Williams bounced back from the most lopsided loss of her career, cruising past Daria Gavrilova 6-1, 6-2 at the Western & Southern Open on Monday.
Rafael Nadal dropped out of the Western & Southern Open on Sunday night, scuttling a reunion of the "Big Four."
Rafael Nadal ended the red-hot run of Greek upstart Stefanos Tsitsipas with a 6-2 7-6(4) win on Sunday that gave the Spanish top seed his fourth Rogers Cup championship.