Sixth seed Andy Roddick fired 14 aces on his way to a superb win over world number three Novak Djokovic in the Dubai Championships semi-finals.
Djokovic congratulates Roddick on his surprise win
The American, who split from coach Jimmy Connors before the tournament, saw off Australian Open champion Djokovic 7-6 (7-5) 6-3.
"I'm excited," said Roddick. "I played well tonight and played the right way."
Unseeded Feliciano Lopez defeated fifth seed Nikolay Davydenko 6-4 4-6 7-5 in the other semi-final.
Spaniard Lopez - ranked 41 in the world - came back from 2-5 down in the final set to secure his victory over the Russian.
I was nervous from the start
Lopez made the worst possible start, winning just one point in his first three games as Davydenko cruised to a 4-2 lead.
But the 26-year-old rediscovered his rhythm and promptly won the next four games to take the set.
The second set was a closer affair, but Davydenko hit back with a break in the ninth game to level the match.
Lopez looked beaten at 5-2 down in the final set, but completed an impressive comeback by reeling off the final five games.
"It was really good for me because to win a match from 5-2 in the third is tough," said Lopez. "I made it but I think I was a little bit lucky."
A disappointed Davydenko blamed errors at crucial times for his defeat.
"At 5-3 I thought I would win the match," he said.
"It was bad luck. On a few points on my serve I made a mistake and he played pretty well, tried to make no mistakes and pushed the ball back.
"It should have been my match but he won."
Roddick looked in fine touch against Djokovic, making the decisive break in the eighth game of the second set to go 5-3 up before serving for the match.
"I definitely had to try to stay the course and try and tough out some games before I got the momentum on my side there in the tiebreak," said the American.
Djokovic admitted: "I was nervous from the start.
"I didn't return well, although of course considering he has the strongest serve in tennis it's not that easy to get the rhythm.
"So I was trying to hold my serve and I was doing it pretty well in the first set.
"I had a couple of break points but he served out well so I didn't use the opportunities that were given to me. That was the difference.
"It could have gone either way if I'd won that first set."