World number one Rafael Nadal remains on track for a first ATP World Tour Finals title after beating Roger Federer to reach the final.
The Spaniard, 27, won 7-5 6-3 in London to claim his 22nd victory in 32 meetings between the pair.
Nadal has reached the final at the season-ending tournament just once before, losing to Federer in 2010.
He will play Novak Djokovic in Monday’s final after the world number two beat Stanislas Wawrinka 6-3 6-3.
This clash between Nadal and Federer attracted another sell-out crowd of more than 17,000 spectators to the O2 Arena.
Federer might have slipped to seventh in the rankings this year, but a 4-0 record against Nadal indoors gave the Swiss star’s followers cause to hope.
The 32-year-old made a better start than he had against Juan Martin Del Potro on Saturday but could not convert any of three break points in game six, and the inconsistency that has plagued him in 2013 returned.
