It was also a second title for Hlavackova at this year's US Open after she teamed up with Belarusian veteran Max Mirnyi to win the mixed doubles on Friday.
"It's been amazing," Hlavackova said. "I can't believe I have won two grand slams this week. "I want to thank Lucie. She helped me as much as Max did."
It was third-time unlucky for Barty and Dellacqua, who lost both of their previous grand slam finals at the Australian Open and Wimbledon this year.
India's Paes, 40, won his third U.S. Open doubles title and the eighth major title of his career. It was Stepanek's second major doubles title after winning the 2012 Australian Open with Paes.
Peya and Soares had only two break points for the match and failed to convert either in their first final of a major championship.
It was also a second title for Hlavackova at this year's US Open after she teamed up with Belarusian veteran Max Mirnyi to win the mixed doubles on Friday.
"It's been amazing," Hlavackova said. "I can't believe I have won two grand slams this week. "I want to thank Lucie. She helped me as much as Max did."
It was third-time unlucky for Barty and Dellacqua, who lost both of their previous grand slam finals at the Australian Open and Wimbledon this year.
India's Paes, 40, won his third U.S. Open doubles title and the eighth major title of his career. It was Stepanek's second major doubles title after winning the 2012 Australian Open with Paes.
Peya and Soares had only two break points for the match and failed to convert either in their first final of a major championship.
NEW YORK, Sept 5 | Fri Sep 6, 2013 12:32am BST
NEW YORK, Sept 5 (Reuters) - Belarus veteran Max Mirnyi will attempt to win his third U.S. Open mixed doubles title 15-years after his first at Flushing Meadows on Friday.
Mirnyi and Czech Andrea Hlavackova will meet American Abigail Spears and Mexican Santiago Gonzalez on Arthur Ashe Stadium.
The seventh-seeded Mirnyi and Hlavackova reached the final by defeating Wimbledon mixed doubles champions Kristina Mladenovic of France and Daniel Nestor of Canada 7-5 6-7 12-10.
The 36-year-old Mirnyi is chasing the 10th major doubles title of his career.
He partnered with Serena Williams to win the U.S. Open mixed doubles crown in 1998 and was triumphant again in 2007 with Victoria Azarenka.
Mirnyi's impressive resume also includes an mixed doubles Olympic gold medal he won with Azarenka in London last year.
Spears and Gonzalez defeated fifth seeds Anabel Medina Garrigues of Spain and Bruno Soares of Brazil 6-3, 6-1.
Spears, 32, will contest her first grand slam final in 63 attempts. (Reporting by Will Swanton in New York, editing by Steve Keating)
The seventh-seeded Mirnyi and Hlavackova reached the final by defeating Wimbledon mixed doubles champions Kristina Mladenovic of France and Daniel Nestor of Canada 7-5 6-7 12-10.
The 36-year-old Mirnyi is chasing the 10th major doubles title of his career.
He partnered with Serena Williams to win the US Open mixed doubles crown in 1998 and was triumphant again in 2007 with Victoria Azarenka.
Mirnyi's impressive resume also includes an mixed doubles Olympic gold medal he won with Azarenka in London last year.
Spears and Gonzalez defeated fifth seeds Anabel Medina Garrigues of Spain and Bruno Soares of Brazil 6-3, 6-1.
Spears, 32, will contest her first Grand Slam final in 63 attempts.
The 35-year-old Bryans, who also won the Olympic gold medal last year, got the measure of their 12th-seeded opponents through the telepathic understanding which has brought them 91 career doubles titles.
They made the decisive break in the ninth game of the fourth set and Bob Bryan served out for victory which he sealed with an ace, prompting a trademark chest-pump by the brothers.
Wimbledon singles champion Marion Bartoli, a close friend of Mladenovic's, watched the match from the stands before heading off for the champions ball.
It was the 40-year-old Nestor's third grand slam mixed doubles title and he has also won eight major men's doubles crowns, including two at the All England Club, and the 2000 Olympic gold medal.
The 39-year-old Raymond has won four grand slam titles in women's doubles and seven in mixed, including last year's crown at Wimbledon in partnership with compatriot Mike Bryan who won the men's doubles title with his brother Bob on Saturday.
