Roger Federer thrashed Andy Murray 6-0 6-1 to end the Britonâ€™s ATP World Tour Finals hopes in humiliating fashion.
The 17-time Grand Slam champion needed just 56 minutes to win his third Group B match and reach the semi-finals.
Murray required a straight-sets win to qualify but won only eight points in the first set and did not win a game until 6-0 5-0 down.
The result is Murrayâ€™s worst since he lost 6-1 6-0 to Novak Djokovic in Miami seven years ago.
Japanese world number five Kei Nishikori qualifies behind Federer after his earlier 4-6 6-4 6-1 victory over Spaniard David Ferrer â€“ a replacement for the injured Milos Raonic.
â€œClearly, Iâ€™m very happy to play a good match today,â€ Federer said. â€œI knew I was qualified so maybe I went in a bit more relaxed.
â€œItâ€™s not the way I thought it was going to go, but thereâ€™s always next year for Andy and hopefully he can have a good season.
â€œAt the end I was happy I didnâ€™t win the second to last game to be quite honest.â€
Jeremy Bates, former British number one
|â€œEveryone who watches a lot of matches knows that is as close to perfection as you can possibly get. Everyone is in shock at that scoreline.â€|
After 24 minutes, Murrayâ€™s progress in the tournament was over as he suffered his first 6-0 set loss in four years.
â€œIt was a tough night,â€ Murray said.
â€œIâ€™ve lost Grand Slam finals, which have been very tough, but in terms of the way the match went it was not ideal from my side of the court â€“ far from it.
â€œHe played exceptionally well, thatâ€™s for sure. I can say Iâ€™m disappointed with my level tonight but if I played well, he probably still would have won anyway.â€
A tight, tense encounter had been anticipated with the Scot needing a fast start, and Federer keen to win the group and so probably avoid top seed Novak Djokovic in the semi-finals.
In the event, only one player brought anything like his best game.
The 17,000 spectators packed into the O2 must have thought they were in a for classic when Murray won the opening two points on Federerâ€™s serve, before the Swiss won an epic 34-stroke rally on the third.
From that moment on it was one-way traffic as Murray struggled to find first serves and Federer produced some sublime tennis.
As the games rolled by, he even threatened to inflict the dreaded â€˜double bagelâ€™ on Murray, whose ambition became drastically reduced.
BBC Tennis correspondent Russell Fuller
|Murray spoke of cutting short his holiday and making technical changes to his game in the immediate aftermath of a defeat that will come as a major shock to his system. Even in the face of what coach Stefan Edberg described as the best tennis Federer has played all year, Murray was simply steamrollered. He has lost all nine of this yearâ€™s matches against Djokovic, Nadal and Federer: a gulf in form and belief has opened up between Murray and the players heâ€™s used to rubbing shoulders with in Grand Slam finals.|
â€œJust try and win the point,â€ he said. â€œTry and set a target of winning points. Try and win two points in a row rather than trying to focus on, â€˜OK, I want to get this game.â€™
â€œYou just try and set smaller goals than that. Thatâ€™s basically it.â€
Federer moves on to the semi-finals and keeps his outside hopes of ending the year as world number one alive, although Djokovic can end that race should he beat Tomas Berdych on Friday.