Event:
Serbian Novak Djokovic beats Swiss Roger Federer to win his second U.S. Men's Open title; a day earlier, Italian Flavia Pennetta beat fellow Italian Roberta Vinci in the U.S. Women's Open to win her first Grand Slam, then announced her retirement
More Notable Events on September 13:
1991 55 ton concrete beam falls in Montreal's Olympic Stadium
1989 Desmond Tutu leads biggest anti-apartheid protest march in South Africa
1978 1st flight of McDonnell Douglas F-18A Hornet
1965 Today Show's 1st totally color broadcast
1788 New York City becomes 1st capital of US
