Two-time major champion Martin Kaymer surged into a two-stroke lead over Adam Scott after the third round at the Memorial tournament in Dublin, Ohio.
Kaymer, without a win since his eight-shot victory at the 2014 U.S. Open, notched six birdies in a six-under-par 66 at Muirfield Village.
The German signed for a 15-under 201 total with one round left.
Fellow major champion Scott also continued a recent resurgence.
The Australian ended his day in style at the 18th with a brilliant eight-iron approach before using his long putter to brush in the three-foot birdie for a round of 66.
Japan's Hideki Matsuyama had the day's best score, chipping in for birdie from lush rough at the last for a 64 that lifted him within four strokes of Kaymer.
Americans Jordan Spieth (69) and Patrick Cantlay (68) are also four behind.