DES MOINES, Iowa - Billy Andrade used a record-setting round to join a crowded leaderboard at the Wakonda Club.
Durant had a 65, and Hamilton shot a 67 to match Andrade at 10-under 134.
''How about that?'' Andrade said. ''Anybody can do what I did, that's how good everybody is. When they got hot, they can flush it out.''
John Daly, the senior newcomer who helped draw a record opening-round crowd on Friday, shot his second straight 74 to drop to 4 over.
Andrade had a topsy-turvy trip to Iowa in 2015, shooting 66-76-66. But Andrade was able to close about as well as anyone has on this course on Saturday, posting birdies on six of the final seven holes to set the mark at a course that the senior circuit first visited in 2013.
A 20-foot birdie putt on No. 13 kicked off a strong finish for Andrade, who entered the weekend winless on the season but fifth on the money list.
''This course is pretty easy. (But) when you're off a little bit it can play really hard,'' Andrade said. ''I hit a few more fairways and I was putting well.''
Durant made birdie on No. 18 following a chip shot that landed within a foot of the hole. Durant also birdied six of his final seven holes to put himself in contention for his first individual win on the senior tour.
Durant tied for second in Iowa last year.
''I played good here last year and came up one short, and I know what I have to do on Sunday to win a golf tournament,'' Durant said. ''I just need to go out and shoot a good round of golf.''
Hamilton, still searching for his first win since British Open in 2004, grabbed a share of the lead despite a chaotic back nine. Hamilton made par just once, but a birdie on the par-3 18th hole pulled him even with Andrade and Durant.
''I haven't been making any putts really for a while,'' Hamilton said. ''I think I might have gotten my share for sure, especially on the back nine.''
Jimenez, who has a win and a pair of top-10s in just three senior tournaments this year, survived a double bogey to shoot 5 under and move within a shot of the leaders entering Sunday.
Inman, the surprise two-stroke leader Friday, had a one-shot lead heading to the 17th hole. But he put his tee shot and subsequent chip from the drop zone into the water and took a triple bogey.