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The world No 1 ranking is now well and truly up for grabs after top seed and defending champion Luke Donald was dumped out of the WGC-Accenture Matchplay Championship by Ernie Els.
There are some mouth-watering match-ups in the first round of the WGC-Accenture Matchplay Championship, including a clash between South African legend Ernie Els and world No 1 Luke Donald.
The points system is fairly complicated to try and give as many people a chance of winning, but realistically you can count the potential winners on two hands.
