Who beat Rafael Nadal in the 2013 ATP World Tour Finals singles final?

Novak Djokovic beat Rafael Nadal in the 2013 ATP World Tour Finals singles final.

The final took place at London's O2 Arena on 11 November 2013. Djokovic won 6–3, 6–4 on an indoor hard court, successfully defending the title he had won the previous year. It was Djokovic's third championship at the season-ending event.

Nadal entered the tournament as the world No. 1 and had enjoyed an outstanding comeback season after missing much of 2012 with a knee injury. He reached the final by defeating Roger Federer in the semifinals, while Djokovic overcame Stan Wawrinka. Despite Nadal's strong season, Djokovic controlled the final with aggressive returning and consistent serving.

This was not their only important meeting in 2013. Djokovic also defeated Nadal in the China Open final, while Nadal won their French Open semifinal and the US Open final. The ATP Finals result therefore formed part of a split season rivalry, rather than representing their overall head-to-head record.