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England's Paul Casey retains a one-shot lead.
In conditions, Casey, 42, taken a six-under 66, including back-to-back birdies on the 13th and 14th holes.
Austria's Matthias Schwab is around five under, together with Scotland's Robert MacIntyre, Germany's Max Rottluff along with England's Ben Stow .
"That is one of the finest rounds I have played this season," said Casey.
"A couple of putts dropped by but it's such a tough golf program.
I had been pleased with the patience I had been showing and the score doesn't do justice to .
"I would have been happy to be under par, never mind .
I am not feeling great, but it is what it is - agreeing that the sick golfer.
" Casey, who was afflicted by a sore throat, has won 13 times on the Tour, but is aiming to get his first success.
Former Masters champion Patrick Reed needed to birdie the last three holes to take at a 74, while world number nine Xander Schauffele was one shot better off despite dropping three shots in his final eight holes.
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