MUMBAI: Bob Costas, a 22-time Emmy Award-winning broadcaster, returns as the primetime host for US broadcaster NBC?s coverage of the 2012 London Olympic Games, which begin on 27 July.

For Costas, this marks his 10th Olympic broadcast assignment and his ninth as the primetime host (Barcelona 1992, Atlanta 1996, Sidney 2000, Salt Lake City, 2002, Athens 2004, Torino 2006, Beijing 2008, Vancouver 2010).

Al Michaels, who hosted daytime coverage at the Vancouver Olympic Winter Games, and Dan Patrick, making his Olympic hosting debut, will host NBC?s live weekday and weekend daytime coverage, and Mary Carillo will once again host the NBC late night show.

Additionally, Ryan Seacrest, tennis legend John McEnroe, gymnastics coach Bela Karolyi, and Carillo, broadcasting her 11th Olympic Games, will serve as Olympic correspondents during primetime coverage on NBC.