63s shot at the U.S. Open

PlayerYearCourseRoundRelation to par

Johnny Miller1973OakmontFourth8 under

Jack Nicklaus1980BaltusrolFirst7 under

Tom Weiskopf1980BaltusrolFirst7 under

Vijay Singh2003Olympia FieldsSecond7 under

Justin Thomas2017Erin HillsThird9 under

Seven other players have shot a round of 9 under in a major, the most recent being Hiroshi Iwata in 2015 in the second round of the PGA Championship at Whistling Straits. Thomas is the first to do it in a U.S. Open.