Mardy Fish clinched his second ATP Tour title in a fortnight when he beat John Isner in the final of the Atlanta Tennis Championships.
Fish, the sixth seed, won in Newport two weeks ago and extended his unbeaten sequence to 10 matches when he edged out second-seeded Isner 4-6 6-4 7-6(4).
The 28-year-old Fish booked his place in the final with an impressive straight-sets victory over top seed Andy Roddick but faced a much sterner task against the big serving Isner.
Isner took the early advantage by claiming the only break of the opener to move one set ahead but Fish rallied in the second, forcing two breaks as the match went to a decider.
Fish raced 3-1 ahead in the third on the back of another break of his opponent's formidable serve, but Isner responded, breaking back to send the game to a tie-break.
The first four points went Fish's way in the tie-break, and while Isner dug deep to reduced that gap to one, Fish responded to wrap up the decider and the match in two hours and 45 minutes.
In Germany Andrey Golubev became the first player from Kazakhstan to win an ATP World Tour title when he swept past Jurgen Melzer in straight sets to claim the German Open crown.
Melzer had not dropped a set all tournament and, in the form of his career, was favourite to claim a third career title against an opponent who is 67 places above him in the rankings.
However, the world number 15 had no answer as Golubev, who had beaten top seed Nikolay Davydenko en route to the final, cruised to a 6-3 7-5 victory in one and a half hours.
The 23-year-old broke Melzer in the eighth game of the first set and, after the Austrian had missed a crucial chance to break back at 3-2 up in the second, Golubev broke again in the 11th game before serving out for the match in only his second ever final.
Golubev will now break into the top 50 for the first time in his career on Monday.
On the WTA Tour, Anna Chakvetadze cruised to a straight sets victory over Johanna Larsson to claim the Slovenia Open crown.
The Russian took little over an hour to sweep past Sweden's Larsson 6-1 6-2 in a rain-delayed final at Portoroz
It is the first title since 2008 for Chakvetadze, who has slipped from the top five to number 103 in the rankings.
Larsson briefly threatened an unlikely comeback towards the end of the match when she had three break points just after claiming her third game.
But Chakvetadze kept her cool to end Larsson's dreams of a maiden victory in her first WTA final.
Ion Austria Julia Goerges clinched her first WTA crown with a straight-sets victory over second seed Timea Bacsinszky at the Nurnberger Gastein Ladies in Bad Gastein.
The unseeded 21-year-old German, ranked 65th in the world and competing in her first Tour final, cruised past her Swiss opponent 6-1 6-4.
Bacsinszky, who had been seeking her second career title since winning her first last October in Luxembourg, led 4-2 in the second set but had no answer when Goerges fought back.
Earlier in the day, Goerges had overcome France's Alize Cornet by the same scoreline in a semi-final clash rescheduled from Saturday due to rain.
On the home front, US Open junior champion Heather Watson won the biggest senior title of her career on Sunday at the ITF US$25,000 tournament in Wrexham.
The 18-year-old from Guernsey secured her fifth straight-sets win of the week, beating top seed and former top-30 player Sania Mirza, of India, 6-2 6-4.
Watson's only previous senior title came at a US$10,000 event in Frinton last summer. She said: "I won a 10k event in Frinton around this time last year but this is definitely a step up.
"Against Sania I just told myself I had nothing to lose because she's been ranked 27 in the world before and she is a really good player. I just did a lot of running and got as many balls in court as I could."