Lowest single-round score in a professional golf tour tournament

According to Official Guinness Records,

The lowest score for a single round in a major professional golf tournament is 58 by Ryo Ishikawa (Japan) at The Crowns of the Japan Golf Tour in Togo, Japan, on 2 May 2010.
Ishikawa, 18 years old at the time of his record round, shot 12 birdies with no bogeys on the 6,545-yard Nagoya Golf Club course. The Japan Golf Tour is one of the 11 major men's golf tours recognised by the International Federation of PGA Tours.

For a complete list of 2010 records, please visit 2010 Guinness Records in Japan.

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