London, Nov.27 (ANI): British tennis star Andy Murray was a clear favourite to go through to the semi-finals after beating Fernando Verdasco 6-4, 6-7, 7-6 in his final round-robin match in the afternoon, but, amid scenes of confusion and to the bewilderment of most in the 17,500 capacity crowd here, the world No 4 went out nearly six hours later when Juan Martin del Potro beat Roger Federer 6-2, 6-7, 6-3 in the last match of the day.
Murray, Del Potro and Federer had all won two of their three group matches, but it was the Argentine and the Swiss who went through thanks to their percentage of games won in the round-robin phase, The Independent reports.
Del Potro edged out Murray by virtue of winning just one more game than the 22-year-old Scot.
However, it was only several minutes after the end of the match that the outcome was confirmed, by which time many of the crowd had left.
Even Murray, watching on television, was left bemused, posting a message on Twitter that read: "Anyone know what's going on? I think I'm out, but the rules aren't worded too well." (ANI)