The FedEx Cup champion played solidly at Augusta, stringing together 12 consecutive pars before birdieing the par-five 13th to get himself to five-under.
He then sunk further putts at 15 and 16 to tie the lead with Angel Cabrera.
Overnight leader Jason Day finished two behind after a one over 73.
A solid round was in the offing after 12 pars and a birdie at 13, however, Day faltered at the end with consecutive bogeys.
See how day three unfolded in full at Augusta, with Sports Mole's live minute-by-minute commentary.