London has extended its deal to host the ATP World Tour Finals until 2015.
The O2 Arena signed a five-year contract to stage the season-ending event, which features the top eight men's players in the world, in 2009.
"We are very happy to announce the extension of our original commitment in London for a further two years, meaning the Barclays ATP World Tour Finals will be played in London for at least the next three years through 2015," said ATP executive chairman Brad Drewett.
The tournament, which started in 1970, has a prize pot of around £3.4m.
