Irwin, who beat Lanny Wadkins 4-and-3 in the first round Saturday morning, sank a 15-foot putt at the 13th hole for his third straight unmatched birdie and a 5-up advantage over Morgan. The match ended when the pair traded pars at the 14th.
'I'm not putting well but it's hard to complain,' said Irwin, who earned the No. 1 seed after two rounds of stroke play on Thursday and Friday. 'I'm managing what I have well and in match play that's a critical part of the equation.'
Irwin, the winner of the 54-hole, stroke-play Boone Valley Classic in 1997 and '99, will face Leonard Thompson in the first semifinal tilt on Sunday. Vicente Fernandez and Bob Gilder are set to meet in the other match.
Thompson needed 19 holes to defeat Ted Goin in the quarterfinals. He moved on earlier in the day with a 3-and-2 win over John Jacobs.
Fernandez, a 1-up winner over Jim Thorpe in the round of 16, earned a place in the semis with a 2-up victory over Terry Mauney. Gilder beat Bruce Summerhays 1-up and Allen Doyle 2-and-1 to advance to play on Sunday.
The semifinal winners will square off in the championship match, which is scheduled for 3:15pm ET on Sunday. The losers will also meet to decide third place.
Click here to see afternoon and morning results from Saturday