- Murray beats Milos Raonic to reach ATP Finals decider
- Comes back from a set down in tournament's longest ever three-set match
- Will meet Novak Djokovic, who defeated Kei Nishikori 6-1 6-1
- Winner of Sunday's final ends the year ranked world No. 1
London (CNN)Never in history has the final match of the season determined the men's year-end world No. 1.