Watch as Elmo sits in an umpire's chair and debates the two letters found on Federer's On-branded sneakers: Is it 'Q' and 'C' or 'O' and 'N'?

As millions across America watch Super Bowl LIX on Sunday there are two words they won't hear in the commercials: Super Bowl.

Roger Federer will star alongside Elmo in a cheeky advert that will air during America's biggest sporting event.