(CNN) -- Defending champion Novak Djokovic will play Rafael Nadal in the final of the ATP World Tour Finals at London's O2 Arena after both men comfortably overcame their Swiss opponents in Sunday's semifinals. World No.1 Nadal dispatched his old adversary Roger Federer in straight sets 7-5 6-3 to book only his second appearance in the season-ending tournament final while Djokovic dismissed Stanislas Wawrinka 6-3 6-3. The results set up what should be an absorbing match on Monday evening and a fitting finale to a season the Serb and the Spaniard have dominated. Together, the pair have amassed more than $20 million in prize money in 2013 and won 16 titles -- Nadal has ten to Djokovic's six.
@highlight
World No.1 and World No.2 will play in Monday's final at London's O2 Arena
@highlight
Nadal beat Roger Federer 7-5 6-3 while Djokovic beat Stanislas Wawrinka 6-3 6-3
@highlight
Pair have met three times on hardcourts this season with Nadal winning twice
@highlight
Djokovic triumphed in most recent encounter in China and is unbeaten in 21 matches
Nadal overcame @placeholder in 79 minutes shading a hard-fought first set before easing through the second as Federer was let down by some untidy errors.