The World Group was the highest level of Davis Cup competition in 2013.

The first-round losers go into the Davis Cup World Group play-offs, and the winners progress to the quarterfinals.

The quarterfinalists were guaranteed a World Group spot for 2014.

Czech Republic defended their Davis Cup title by defeating the Serbian team in Belgrade in the final.

[1][2] The doubles match was the second longest match of all time (7 hours and 1 minute).