AICHI, Japan — Ryo Ishikawa shot a 12-under 58 — the lowest score ever on a major tour — today to win The Crowns for his seventh Japan Tour title.

The 18-year-old Ishikawa, six shots behind leader Shigeki Maruyama at the start of play, had 12 birdies in his bogey-free round at Nagoya Golf Club.

Ishikawa birdied nine of the first 11 holes. He added birdies on Nos. 14 to 16 and closed with two pars to finish at 13-under 267, five strokes ahead of Hiroyuki Fujita and Australia's Paul Sheehan.

"I got off to a good start for the first time in four rounds, so I told myself not to give up for the title until the end," Ishikawa said. "To my surprise, I found myself making this many birdies. I was in a calm mental state for all 58 strokes."

Ishikawa broke the Japan Tour record of 59 set by Masahiro Kuramoto in the first round of the 2003 Acom International. On the PGA Tour, Al Geiberger, Chip Beck and David Duval share the record at 59. Annika Sorenstam also had a 59 on the LPGA Tour.