Mirza and Soares defeated American Abigail Spears and Mexico's Santiago Gonazalez 6-1, 2-6, 11-9.
Soares claimed a second US Open mixed doubles title to go with his 2012 victory with Russian Ekaterina Makarova. Mirza had lifted mixed doubles titles at the 2009 Australian Open and 2012 French Open with compatriot Mahesh Bhupathi.
Mirza's win comes just a month after she was described by a Hindu nationalist politician as "Pakistan's daughter-in-law" and unfit to be a representative of India.
The blast was delivered by K. Laxman, a regional legislator belonging to the national ruling Bharatiya Janata Party (BJP), who questioned the credentials of Mirza to be "brand ambassador" for the country's newest state Telengana.
Mirza, 27, and married to former Pakistan cricket captain Shoaib Malik, broke down in tears over the conrtroversy.
"It was tough, you know. Just before I left there was a lot happening at home. But, yeah. Still a proud Indian, I guess, five weeks later," said Mirza, whose women's doubles campaign with Zimbabwe partner Cara Black ended on Thursday at the hands of Martian Hingis and Flavia Pennatta.
Mirza and Soares, playing their first event together, needed six match points to take victory on Friday with the Indian star celebrating by performing an enthusiastic bunny hop into the arms of the Brazilian.
"I got tight. He held his nerve. I needed that a little bit with my serve. I was serving well till then," said Mirza, who double faulted on the first match point.
"I was making a lot of first serves. It's never easy. No matter how many you win, never easy to close it out."
COMMENTS (12)
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@Hindu, Your statement is in very poor taste. I am a Hindu and please do not represent me by calling yourself Hindu.
Let Sania pick the country she want t represent. Also, her legal residency matters. I am not sure if she lives Pakistan or India seance she got married. I would think Pakistan. If so, let Pakistanis call her their own.
@truthplease: @Ishan: @kapil kashyap: Chill. No one asked her to become Pakistani. Let us be proud of our babhi -.-
Life is.about growing beyond the borders, nationalties, religions, which become totally meaningless when tied in the sacred bond of love.
Interesting is the fact, that both speak the same language, have the same music, food and above all paan culture.
What this loving couple certainly do not have is the ugly culture of hatred between Indians and Pakistanis.
Congratulations bhabi jaan :)
Shoaib how u endure seeing her with another man
Sania Mirza didn't make pakistan proud. Pakistanis are feeling proud of her making out a connection with her. She was, she is and she will always be an INDIAN It was her personal choice to marry a foreign national, although some fools in India take a dig at her for this and question her patriotism but I am sure they are very few in numbers. Majority of Indians are proud of her and she an idol for most of the girls who are trying to make an identity of their own in the male dominated society.
Congrats Sania, wish you many more Grand Slam titles !
Some people have their own opinion, it wasn't an official statement of BJP. Sania is a citizen of Hind and we are proud of her.
Sania makes Pakistan proud