Leander Paes won the US Open Mixed Doubles Tennis Title (2015) partnering with Martina Hingis. Leander Paes and Swiss Martina Hingis became the first pair since 1969 to win three Grand Slam mixed doubles titles in the same season at the US Open. The United States Open Tennis Championship is a hard court tennis tournament. Since 1987, the US Open has been chronologically the fourth and final tennis major comprising the Grand Slam each year; the other three, in chronological order, are the Australian Open, the French Open and the Wimbledon.