Miguel Angel Jiménez ended the third day of the Senior Open Championship Presented by Rolex at the top of the leader board.
He fell short of equalling the course record at Carnoustie when he missed a six-foot birdie putt at the last, but a four point lead made up for that.
The 52-year-old hit a bogey-free 65 bringing his tournament total to 205 - 11 under par.
Joe Durant dropped a shot at the last, missing the chance to narrow the gap to three strokes between him and Jiménez.
Instead Durant had to settle for tied second place alongside Tom Byrum, Wes Short Jnr and the leading British contender, Paul Broadhurst, who are on seven under for the tournament.
Broadhurst, making his debut in the Senior Open, hit a four under par 68 on the third day for or a 54-hole total of 209. He will go head-to-head with Jiménez in the final group.
After finishing top of the leader board on day two, Kohki Idoki carded a 77 on the third day, putting him in tied 18th with 54-hole total of 214.
Bernhard Langer is on three under par for the tournament, with a 54-hole score of 213, putting him in tied 12th position, while Tom Watson is two over for the three days, with a score of 218.