LONDON, July 11 (Reuters) - Britain welcomed a new Grand Slam champion in the form of Neal Skupski as he partnered American Desirae Krawczyk to the mixed doubles title at Wimbledon on Sunday. The seventh seeds beat all-British duo Harriet Dart and Joe Salisbury 6-2 7-6(1) on Centre Court. It was Krawczyk"s second successive Grand Slam success after she and Salisbury won the French Open in June. Dart and Salisbury were hoping to become the first all-British pair to win the mixed doubles event at Wimbledon since Jo Durie and Jeremy Bates in 1987.