The BBC will broadcast its major Wimbledon matches in high definition as part of its pioneering trial.
You can watch Federer in high definition at Wimbledon this year
The BBC HD trial kicks off with the opening game of the football World Cup and includes the 9 July final.
The World Cup will be the first major sporting event to be broadcast in HD in the UK.
The BBC's HD trial will then continue at Wimbledon from 26 June-10 July.
HD is a new kind of television which delivers more detailed pictures and sharper shots of fast-moving action than conventional 'standard definition'.
The HD format will be an extra stream available alongside conventional analogue and digital broadcasts.
It will only be accessible to viewers who have all of the following:
HD ready televisionsHD set top boxesHD services from satellite or cable providers.
The BBC HD trial will run for about 12 months.
It will feature some of the BBC's most ambitious programmes, such as natural history series Planet Earth and Galapagos and drama documentary Hannibal, in HD quality.
BBC Director of Sport Roger Mosey said: "High definition works particularly well for sport.
"It gives fantastic picture quality, from the blades of grass that are being played on right to the back of the stands, and although only limited numbers of people will be able to see this trial we hope it will be a glimpse of the future."