Answer
The 2011 US Open Mixed Doubles title was clinched by Jack Sock and Melanie Oudin, an unseeded duo who made history as the first all-American team to win the US Open Mixed Doubles title since 1993. Sock, then a 19-year-old from Kansas, and Oudin, a 20-year-old from Georgia, defeated the Australian pair of Casey Dellacqua and Matthew Ebden in straight sets in the final.