LEADING: Shane Lowry had a 63 and set the British Open record for 54 holes at 16-under 197.
TRAILING: Tommy Fleetwood (66) was four shots behind.
CHASING: Brooks Koepka had a 67 - his 15th score in the 60s in his last 19 rounds in the majors - and was seven behind.
ROUND OF THE DAY: Lowry became the 13th player with a score of 63 or better in the British Open.
SHOT OF THE DAY: Tony Finau chipped in from 30 yards off the 18th green for a birdie.
KEY STATISTIC: Fleetwood has made only two bogeys through 54 holes at Royal Portrush and was at 12-under 201 and still trailing by four.
NOTABLE: This is the second time Lowry has had the 54-hole lead in a major. He was four ahead in the 2016 U.S. Open at Oakmont, shot 76 and finished three shots behind Dustin Johnson.
QUOTABLE: "Every time I had a putt today, I just wanted to hole it because I wanted to hear that roar." - Shane Lowry.
KEY PAIRINGS: Shane Lowry and Tommy Fleetwood, 8:47 a.m.; J.B. Holmes and Brooks Koepka, 8:37 a.m.
TELEVISION: Sunday, 2:30 a.m. to 6 a.m. (Golf Channel); 6 a.m. to 2 p.m. (NBC).
More AP golf: https://apnews.com/apf-Golf and https://twitter.com/AP_Sports
Copyright 2019 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.