KUALA LUMPUR, MALAYSIA - OCTOBER 21: Russell Knox of Scotland plays a shot during day two of the 2016 CIMB Classic at TPC Kuala Lumpur on October 21, 2016 in Kuala Lumpur, Malaysia. (Photo by Stanley Chou/Getty Images) -

AUGUSTA, Ga. - Luke Donald was assessed a two-stroke penalty midway through his round on Thursday at Augusta National for grounding his club in a hazard.

Donald played his third shot from a greenside bunker on No. 9 and left his attempt in the bunker. Before hitting his third shot he touched the ground in the bunker with his club, violating Rule 13-4.

The Englishman made a quadruple bogey-8 on the ninth and signed for a 79.

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"Pretty dumb mistake," Donald tweeted after his round. "I can accept the odd poor shot but making a mistake like that is pretty frustrating and so unlike me.

"Oh well, nothing I can do about it now, brush it off and try and make a bunch of birdies tomorrow."