Graeme McDowell's involvement in this year's Masters has been thrown into doubt.
The Ulsterman has been forced to withdraw from the opening round of the Valero Texas Open, after aggravating a stress injury to his lower left leg.
He was on 5-over par after nine holes.
Strong winds are playing havoc with the field in San Antonio where Shane Lowry will tee-off later this hour.
Just two players are below par at the moment.
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