NEW YORK -- Top seed Roger Federer held off the determined challenge of Nikolay Davydenko to score a straight sets 7-5 6-1 7-5 win to reach the final of the U.S. Open where he will play Serbia's Novak Djokovic.
Federer celebrates reaching yet another grand slam final.
Federer, searching for his third grand slam victory of the season after claming the Australian and Wimbledon crowns, was pushed to his limits in rollercoaster first and third sets by his Russian opponent.
Fourth seed Daydenko caught his Swiss opponent cold to take an immediate 2-0 lead until Federer broke back in the fifth game on his fifth break point.
A further breakthough saw Federer serve for the set but Davydenko leveled it up only to lose his delivery again in the 12th game as Federer took the opener.
Two breaks of service were enough for the world number one to ease through the second set, but the third proved a far tougher proposition.
Davydenko broke his illustrious opponent three times in a row, and had two set points at 5-4, but incredibly each time Federer responded to level.
Davydenko was duly broken again and Federer comfortably served out to wrap up victory in two hours 21 minutes to reach his 10th successive grand slam final as he chases his 12th grand slam crown.
He is looking forward to his meeting with Djokovic who beat him at the Montreal Masters.
"He has been playing fantastic tennis. It's definitely going to be exciting," Federer said.
Earlier, third seed Djokovic beat Spain's David Ferrer 6-4 6-4 6-3 to reach his first grand slam final at the age of 20.
Djokovic started slowly against the tenacious Ferrer, and struggled at times with the heat and humidity, but he always had too much pace and power for the Spaniard.
"I started really nervous. I had played a lot of difficult matches and I didn't have a lot of energy --plus he is a tough competitor," said Djokovic -- who becomes the youngest finalist in New York since Pete Sampras won the title in 1990.
"I will try to recover as much as I can and rest. I am going to watch my opponents play. It will be an amazing experience for my first Grand Slam final and it's a great achievement for me and for my country."
The 25-year-old Ferrer, who upset second-seeded compatriot Rafael Nadal in the fourth round, opened the stronger to take a 3-0 edge and then a 4-1 lead.
But Djokovic found his range with a vengeance, winning 12 straight points to level at 4-4. He then broke Ferrer's serve again and held serve to lift the first set in 33 minutes.
It was one-way traffic as Djokovic broke Ferrer's serve to open the second set and he made it seven games in a row to go 2-0 up despite some brave resistance from the 15th seed.
Ferrer finally stopped the rot by holding his own serve and his hopes revived as Djokovic needed medical treatment at the changeover, complaining of suffering from a headache brought on by the heat and humidity. The Serb promptly dropped his serve in the following game as Ferrer levelled at 2-2.
Djokovic, who quit his Wimbledon semifinal against Nadal due to injury, looked in discomfort, but still managed to steady the ship by breaking the Ferrer serve in a lengthy seventh game to take a 4-3 lead.
He held on to his next two serves to take a 2-0 lead and then pounded Ferrer into submission at the start of the third.
Djokovic grabbed the vital break he needed in the third game and although he needed further medical aid at the next changeover, the Serb comfortably pushed home his advantage against an increasingly outgunned Ferrer. E-mail to a friend