He resumes from level par at 1.50pm.
It's the Offaly native's final tournament before next week's US Masters.
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Padraig Harrington, who needs to win the tournament in order to gain entry into his 16th US Masters, tees off from 1 over par at 2.20pm.
Leader Charley Hoffman is 8 under par and gets his second round underway at 2.00pm.