Stewart Cink leads Padraig Harrington by one at the U.S. Senior Open.

Cink shot a bogey-free 6-under 64 on Saturday at Scioto Country Club to reach 9-under 201 after 54 holes. He led defending champion Padraig Harrington by one stroke entering the final round.

Cink's round included an eagle on the par-5 sixth and tied the low round in a USGA event at Scioto. George McNeill was two shots back at 7 under after holding the 36-hole lead.