Day tweaks back in match play triumph

Jason Day's 3 and 2 victory over Graeme McDowell at the WGC Match Play on Wednesday left the world No 2 nursing a sore back that raised concerns about his status for the rest of the week - and next month's Masters.

Day, who headed straight for treatment after signing his scorecard at Austin Country Club in Texas, was limping slightly coming off the 15th green and was clearly in pain when he dropped his driver after teeing off at the next hole.

The Australian limped gingerly down the side of a fairway bunker to play his second shot at the par-five 16th, and was down on his knees alongside the green when Northern Ireland's McDowell missed a birdie putt that would have extended the match.