Johnson also shot a career-best 47.1% from the field.
Dumars and Johnson shot a combined 7 for 21 Sunday.
Johnson has averaged 16.5 points and shot 49 percent from the field.
Johnson had shot a combined 4 for 28 in the two regular-season losses to Villanova.
As soon as he began, Johnson shot him through the wooden door.
Johnson, who entered the round two shots behind Kuehne, shot a 40 on the back nine.
Johnson has shot 47.5 percent from the field, averaging 18 points and 6 rebounds - totals well above his numbers for the regular season.
Seeing nothing, Johnson attacked and shot it down.
Johnson shot back: "Hey, I scored more points than you in the second half."
Of the starters, only Johnson shot well, scoring 18 points and making 6 of 10 shots.