Couples had seven birdies in a round of 64, while Peter Fowler finished with a 65 to trail the leader by two shots.
“I’m just happy to be in the hunt with 18 holes to play,” said Langer, who won this title two years ago at Carnoustie. “There’s a lot of guys in with a chance, so I know I’ll have to shoot one of the lower scores to win.”
Americans John Cook (66) and overnight leader Gary Hallberg (73) joined England’s Barry Lane (66) at four shots back.
Tom Watson (66) and Tom Lehman (73) were seven shots behind Langer.
LPGA/EUROPEAN LADIES TOUR: In Paris, Stacy Lewis made a birdie on the last hole to share the lead with South Korea’s Inbee Park after the third round of the Evian Masters.
Lewis, who is chasing her third LPGA Tour title of the year, had 1-over-par 73 and is 11-under for 54 holes.
“I feel like I’m still in the tournament, and just got to make some putts tomorrow,” said Lewis, who equaled the course record in her opening round. “I shot 63 the first day, so I know I can play good out here. I’m not too worried about it.”
Park, who was three shots behind Lewis in third place after 36 holest, had four birdies and two bogeys for 70.
Karrie Webb (67), Natalie Gulbis (68) and 17-year-old amateur Hyo Joo Kim (69) of South Korea were one shot behind the leaders.
EUROPEAN TOUR: In Atzenbrugg, Austria, Bernd Wiesberger had 7-under-par 65 to win the Austrian Open by three strokes for his second tour title.
The Austrian, who was four strokes off the lead going into the final round, finished at 19-under 269.
Shane Lowry (66) of Ireland and Thomas Levet (68) of France tied for second.
Wiesberger won the Ballantine’s Championship in April.
Third-round leader Thorbjorn Olesen dropped to fifth place after 74.
Former Augusta State golfer Scott Jamies tied for eighth place after a final-round 68 brought him home at 276. Oliver Wilson, another former Jaguar, tied for 15th place. He closed with 74 to finish at 280.
WEB.COM TOUR: In Columbus, Ohio, Ben Kohles shot 4-under-par 67 to take a two shot lead in the Children’s Nationwide Hospital Invitational.
Cliff Kresge (64 on Saturday) is tied for second lace with Aaron Watins (65) and Trevor Murphy (74)
Aiken native Matt Hendrix shot 71 and is tied for 48th at 212.
Augusta’s Scott Parel is tied for 53rd after 73 left him at 213.