The 121st Wimbledon tennis championships get underway, with over 650 matches to be staged on the famous grass courts over the next fortnight. The action starts on Centre Court, with Roger Federer back to defend the title he has now won four times. Presented by Sue Barker. The reporters on play include Hazel Irvine and Phil Jones, and among the commentators are John McEnroe, Peter Fleming, Barry Davies, John Lloyd, Virginia Wade and Andrew Castle.