* Federer beats Murray to claim year end No.1 spot
* U.S. Open champion back on track
* Federer up next for Del Potro
By Martyn Herman
LONDON, Nov 24 (Reuters) – There are plenty of special effects inside the O2 Arena for the ATP Tour Finals but nothing could match the sight of Roger Federer in full flow as he beat Andy Murray on Tuesday to guarantee the year-end No.1 ranking.
Federer did not have to be at his magical best but after a wobbly start he took control midway through the match and treated the 17,500 capacity crowd to some shots that only he can play, reeling off the last six games for a 3-6 6-3 6-1 victory.
His second three-set win in Group A meant that world number two Rafael Nadal can no longer close the points gap in the rankings and Federer will have the honour of finishing the year as the world number one for the fifth time in his career.
Only Pete Sampras, who managed the feat six times in the 1990s, and Jimmy Connors, who did it five times in the 70s, have achieved that since rankings were introduced in 1973.
Federer also becomes the only man other than…
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