According to Official Guinness Records,
The most consecutive rounds leading the golf US Masters is five and was achieved by Jordan Spieth (USA), at Augusta National Golf Club, Augusta, Georgia, USA, on 7 April 2016. Jordan Spieth won all four rounds in the 2015 competition, he extended this tally by completing the first round of the 2016 Masters with a score of 66.
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.