Funk is at 13 under heading into Sundays final round at Crooked Stick. Norman also had a 68, while Sindelar scrambled to finish with a 70. Amateur Tim Jackson, the overnight leader, shot a 73 and is three shots behind at 10 under.
Russ Cochran set a course record with a 64 after entering the day at even par.
Funk, Norman, Sindelar and Jackson all held the lead at some point Saturday.
Norman entered the day three shots off the lead. He got off to an ordinary start before getting birdies on Nos. 5, 8, 11 to inch his way up the leaderboard. He got an eagle on the 15th hole to take the lead at 13 under.
Jackson stumbled for the first time at the tournament. His score of 133 over the first two days matched the tourneys best 36-hole mark.
Sindelar, who started the day one shot behind Jackson, was at 13 under after No. 13, but had a bogey on the 14th and managed par on the remaining holes.
Cochran was surprised to set the course record. The 50-year-old hadnt placed higher than 19th in his past five senior events. He had nine birdies in what he called one of his best days as a golfer. On two occasions, he birdied three consecutive holes.
The previous course record was set Thursday, when Norman, Sindelar, Jackson and Dan Forsman all shot 6-under 66.
Tom Watson, the runner-up at the British Open, shot a 3-over 75 and had a share of 41st at 2 over.
Last years winner, Eduardo Romero, shot a 70 to move up to 3 under.