CASTLE ROCK, COLO. ? There aren’t many players who make more eagles and birdies than Billy Mayfair. And there aren’t any tournaments that reward below-par shooters the way the International does.

Mayfair, who ranks second behind only Vijay Singh in birdies and eagles this season, rolled in a 70-foot putt for eagle on No. 17, then finished with a birdie to take the lead after the first round of one of the tour’s most unique events Friday.

“Any more on this tour, it’s better to be aggressive than anything else,” Mayfair said. “I’ll play the same way tomorrow – as aggressive as I can. But not stupid.”

Playing at high altitude (6,300 feet) and using the modified Stableford scoring system, two factors that reward big hitters and aggressiveness, Mayfair scored 15 points to lead Brandt Jobe by two, D.A. Points and Charles Howell by three and Geoff Ogilvy and Tim Petrovic by four.

Under the Stableford scoring system, players get five points for eagles, two for birdies, nothing for pars and lose one point for bogeys.

Mayfair finished with five birdies to bring his total to 313 for the year. But it was his long roller on No. 17 – for his 13th eagle of the year – that went down as the shot of the day.

Howell, Jobe and Points also made eagle on No. 17, an uphill, 492-yard par-5 that more often than not determines the winner of this tournament. If things keep going the way they started, the final round could be fun: The 17th yielded 15 eagles in the opening round; last year, it produced 17 over all four rounds.