Juan Martin del Potro earned his revenge after six losses this season to hometown hero Roger Federer when he won the Swiss Indoors title 6-4, 6-7 (5-7), 7-6 (7-3).
The upset victory over the top seed in two and three-quarter hours denied world number one Federer a sixth title from the last seven editions at the St Jakobshalle and kept him from the 77th of his career.
Del Potro last beat the Swiss star in 2009 when he captured the US Open at Federer's expense as well as posting a victory in the year-end final two months later.
Del Potro won the 13th trophy of his career and improved to 62-14 on the season.
"This is a great win for me, a dream," said Del Potro, who finished with 10 aces to the 18 of Federer, holder of six trophies in 2012.
"It's an honour to be on the court with Roger, who is the greatest of all time, it's great to share this moment with him."
Federer suffered his first loss at the tournament which he has ruled since the 2009 final against Novak Djokovic.
"You played a great match and deserved to win," Federer told Del Potro during the trophy ceremony.
"I beat you in a couple of tight matches this year, so it was your turn after those tough losses. I'm happy for you, you played a great match today."
"Overall, I played pretty well," added Federer, who revealed that he has withdrawn from the Paris Masters starting on Monday in order to rest for the World Tour Finals a week later in London.
"He got off to a better start and made the best of it. He was better than me in the first set.
"It was close in the second and he didn't play a very good tie-break. I had my chances in the third and couldn't take them. I tried to take it to him but it wasn't enough today."
Del Potro now heads to Paris after qualifying this week for the eight-man field in London.
"I'm hoping to get back to my best level," said the former top five-ranked Argentine, who missed the 2010 season with a wrist surgery.
"Roger gave me a really tough match. It is super to win this fantastic title."
Federer was appearing in his seventh straight Basel final and ninth overall in 13 editions; he now stands 5-4 in hometown finals.
Del Potro expanded his win streak to 10 matches, last losing to Djokovic in the US Open quarter-finals.
He stands 17-1 indoors this season after adding Basel honours to trophies in Marseille, Estoril and Vienna.
AFPTags: tennis, sport, switzerland, argentina First posted October 29, 2012 07:19:39