Nishikori would grab the first set 7-6 (9), but Murray didn’t let the setback unravel his nerves completely. He picked up the next two sets 6-4, 6-4 to maintain a perfect 2-0 record in round-robin play. The 29-year-old was frustrated often, needing three games to close the match after racing out to a 5-1 lead.
Still, Murray avoided a breakdown, and earned sweet revenge after losing to Nishikori in the US Open quarterfinals in five sets when he famously lost his focus after a speaker malfunction disrupted play.
The Scot is a new man these days, perched high atop his throne of the ATP rankings. He has won 22 matches in a row (having not lost since falling to Juan Martin del Potro in the Davis Cup semifinals in September).
Murray's win on Wednesday means his hopes of keeping the No. 1 spot for the rest of the year are still very much alive. The man trying to wrestle that ranking from him, Novak Djokovic, is already into the semifinals.