CONCORD, Massachusetts (Ticker) -- Bob Gilder, coming off a playoff victory, has a one-stroke lead heading into Saturday's second round of the FleetBoston Classic.

Gilder, who posted his third career Senior PGA Tour victory at last week's SBC Senior Open by beating Hale Irwin on the first extra hole, fired a bogey-free 6-under-par 66 on Friday. He posted one birdie on the front nine and five over the final nine holes.

Sixth on the money list with just under $1.1 million, Gilder has a one-shot lead over five golfers, including two-time defending champion Larry Nelson. Joining Nelson at 67 are Jack Spradlin, Wayne Levi, Dave Eichelberger and Tom Jenkins.

Nelson won a season-high five times in 2001 but has yet to break through this year. However, he has been been very successful at the Nashawtuc Country Club, winning here in each of the last two seasons.

Nelson's best finish this season is second at the TD Waterhouse Championship in May.

Two shots off the pace at 4-under 68 are Rodger Davis and Allen Doyle, who celebrated his 54th birthday.

Legendary Arnold Palmer, 72, recorded the only eagle on Friday and carded a 3-over 75, his lowest round of the year.

Gilder got his round going by rolling home a birdie at No. 6 but really heated up at No. 10, when a 12-foot birdie putt dropped. He followed that with a birdie at No. 11 and highlighted his round with a 30-footer for birdie at No. 14.

Gilder capped his round by taking advantage of the par-5 18th, sticking his approach shot within 3 1/2 feet and converting the birdie opportunity.

Nelson looked like he was ready to run away from the pack early, posting four consecutive birdies beginning at No. 3. But he cooled off and managed just two birdies sandwiched around a bogey over the final 12 holes.

Levi, the 1990 PGA Player of the Year, is in his first season on the elder circuit. He also played a bogey-free round, highlighted by three straight birdies.

Hale Irwin shot a 71 and has posted 22 straight rounds at par or better here. He won this title in 1997 and 1998 and was second in 1995 and 1999.