Scottie Scheffler has been in sensational form in recent weeks, though he struggled to find his rhythm in the opening round of the US Open, with the world No. 1 letting his frustrations get the better

World No. 1 and defending PGA Championship winner, Scottie Scheffler, believes that this week's U.S. Open, hosted at the Oakmont Country Club in Pennsylvania, will be quite the test.

All three were between seven and eight shots behind the leader, and all were in danger of being cut Friday. The U.S. Open remains golf’s cruelest test.