Enda has to battle to make Masters decider.
He displayed sizzling pace to challenge for the lead into the third bend, but Johnny Whitesox shot past Fatboyz Nodrog to lead on the final turn and ran on to hold Tyrur Enda by a length in 29.96sec.
Another three lengths back, Krug Ninety Five ran on from the back to claim third spot by half a length from Razldazl Lord.
The result of the other semi was verymuch in balance right through, with all bar slowstarting duo De Ex Factor and Fatboyz Tyson involved in the battle. Leeview Jet showed the superior early and led into the back narrowly from Beaming Dilemma and Colorful Champ.
At this stage the Pat Gordontrained Thurlesbeg Joker, who had come in as a reserve for Tyford Comet, changed gears and moved up to challenge. Beaming Dilemma battled on well, but Thurlesbeg Joker got up to beat him by half a length in 29.76sec, with Leeview Jet a length third.
At CURRAHEEN PARK, Pat Guilfoyle's Definate Opinion justified his hot market position with a clear-cut win in the Oliver Hawkes Memorial 575 semi-finals. He was shaded to the bend by Headleys Mentor, but took over at that point and went clear to score by over four lengths in 31.14sec.
In the other heat the Robert Gleeson-trained Hare Mack came in as a reserve for Cowboy Mick and made the most of his opportunity, scoring by a length in 31.23sec.
Draw for Saturday's Masters: 1 Beaming Dilemma, 2 Tyrur Enda, 3 Leeview Jet, 4 Krug Ninety Five (m), 5 Thurlesbeg Joker (w), 6 Jonny Whitesox (w).