Playing his third straight tournament after a six-month hiatus for health reasons, Stricker was at 17-under 199 as he seeks his second win in the past three tries in the PGA Tour Champions major at Greystone Golf & Country Club. He had three straight birdies on holes 13-15 after his lone bogey and polished off the round with a fourth.
Stricker is seeking his fourth major championship on the 50-and-over circuit.
Alker birdied the final two holes for a 65. A two-time winner this year already, the Charles Schwab Cup points leader is chasing his first major championship.
“It would mean a lot,” Alker said. “I’ve won three times and the majors are a big deal out here. We’ve got five of them, so we’ve got a good shot at a few.
“You always say try and treat it as another day. But that’s what I’m going to try to do. I’m just having fun out here and hitting my shots.”
Miguel Angel Jimenez, the 2018 winner, had a 67 to get to 12 under. He finished the round with a birdie and is also seeking his third win of the year.
Appleby had a bogey-free 68 and has hovered at 68 or 69 each day. Harrington had a more adventurous round and closed his 70 with an eagle on the par-5 18th. He had bogeys on two of the first six holes.
Stricker powered his approach shot off the grandstand on 18, taking advantage of the rebound well back onto the green. He lost a one-hole playoff to Alex Cejka last year on the Founder’s Course.
Cejka was disqualified after a 66 Saturday for using a yardage book that had not been approved for the competition by the PGA Tour Champions Rules Committee.
Stricker already has tied for 10th and second in his first two outings since his return after spending nearly two weeks in a hospital and dropping 25 pounds. Now, he’s trying to hold on for another major.
Harrington and Scott McCarron were 2 shots behind Stricker entering Saturday, and both fell back. McCarron followed up his round of 65 with a 77.