OKLAHOMA CITY ? Tom Watson used an eagle and solid putting to shoot a 6-under-par 66 Saturday and take a share of the lead after three rounds of the Senior Tour Championship. Watson and Gil Morgan were each at 9-under 207 going into today’s final round of the season-ending event.

Second-round leader Hale Irwin was at 210 after a 1-over 73. Irwin needs to finish fourth or better to become the first senior golfer to win $3 million in one season.

Fuzzy Zoeller shot a 3-under 69 and is tied with Irwin. Bob Gilder, who began the day one stroke off the lead, shot a 73 and stood at 211 along with Larry Nelson, Morris Hatalsky and Allen Doyle.

Watson, who has not won this year, needed just 23 putts to shoot the best round of the tournament. On a cloudy day with temperatures in the 40s, he birdied the first hole to start a 4-under 32 on the front nine, highlighted by his eagle on the par-4 seventh which he double-bogeyed in the first round.

The 435-yard seventh is the No. 1 handicap hole at Gaillardia Golf & Country Club in part because it usually plays into a south wind. The breeze was from the north on Saturday, leaving Watson a 132-yard approach that he holed with a 9-iron.

“It drew back a little bit, hit the flag but stayed up,” Watson said. “Even with my bad eyes, I still thought I saw the ball on the green there. That was the highlight of the round.”

Watson made the turn at 7 under, then added birdies on 13 and 17. His shortest birdie putt was his last, an 8-footer.