Lucas Herbert carded a stunning 6-under 28 on the front nine at Royal Birkdale during the second round.
The Australian golfer, a member of LIV Golf's Ripper GC, joined the professional ranks in 2015.
Herbert's performance ties a long-standing British Open record for the lowest front-nine score.
Before this tournament, Herbert had struggled in majors, missing the cut in nine of his previous 17 starts.