Five players posted rounds of 5-under-par 67 on the Palmer Course at Turtle Bay Resort to share second place. Those five were -- Tom Kite, David Eger, John Harris, Tom McKnight and Kiyoshi Murota.
Funk got his round going with a 10-foot birdie putt on the par-5 third. After birdies on five and seven, he made the turn at minus-3.
The 50-year-old moved within one of the lead as he converted a birdie putt from 20 feet out on the 11th. Funk then gained a share of the lead when he got up and down for birdie on the par-five 12th to move to 5 under.
Funk drained a 20-foot birdie putt at 14 to move out in front. He extended his lead to two strokes with a 10-foot birdie putt at the last.
'I had a good putting day. I had good speed on my putts,' said Funk, who claimed the AT&T Championship last year for his lone win during his rookie season on the Champions Tour. 'The course was playing hard with the wind. I got away with some marginal shots today, but it feels good to shoot 65.'
Kite also carded a bogey-free round. He birdied the third and ninth on the front side. Around the turn, Kite collected three more birdies to move into a share of second.
Harris reeled of three birdies in a four-hole span from the sixth. After dropping a shot on the par-4 11th, Harris birdied the next three holes to end at minus-5.
Eger stumbled out of the gate with bogeys on one and two. He got one of those strokes back with a birdie on three. Eger moved into red figures with back-to-back birdies from the sixth.
The 54-year-old traded a birdie for a bogey from the 11th. At the 14th, Eger started a run of four straight birdies that gave him a share of second.
'I didn't play real well, it was a lot of work,' admitted Eger. 'I probably could have shot 75 today and I'm not sure I could have shot much lower.'
Murota birdied the first three holes, but collected just two more birdies the rest of the way.
McNight didn't sink his first birdie effort until the eighth. He came right back with a birdie on nine and three back-nine birdies gave him a share of second.
Jerry Pate, D.A. Weibring and David Ishii are tied for seventh place at 4-under-par 68.
Defending champion Loren Roberts was minus-3 in the opening round and that put him in a tie for 10th. He stands alongside Des Smyth, Chip Beck and two- time U.S. Senior Open champion Allen Doyle.