On a disastrous night for the bookies at Dundalk, the first five favourites came home in front at the all-weather venue.
First to strike was Opera Gloves, which took the opening maiden at odds of 1/2, although Mick Halford's charge had to work hard under Shane Foley to get the better of Mischief N Mayhem.
"She didn't have the best of draws, but Shane was always happy with her and she was well on top at the line," Halford said.
The second race also went the way of the market leader, as Joseph O'Brien rode his first winner in Ireland since being crowned champion jockey when Beat The Ballot took the rated race.
Despite drifting from 5/4 to 2/1, Tracey Collins' charge travelled well before hitting the front at the two-furlong pole to beat Golden Shoe by a length-and-a-half.
There was more gloom for the layers in the third race as Captain Joy made it a double for Collins. Sent off at 6/4, Ronan Whelan's mount wore down Akasaka close home to get up by half a length.
Race four also went to the market leader as the Willie Martin-trained Farmleigh House repeated last month's course and distance victory when taking the six-furlong handicap under Niall McCullagh.
Knock Stars took the field along and had her rivals at work two furlongs out, but Farmleigh House soon hit top gear and collared the front-runner just inside the furlong pole before quickening up to win by a length and a half.
Garvan Donnelly's Samollie then ran out a game winner of the first division of the seven-furlong handicap to make it five successful favourites on the trot. Backed from 5/1 into 7/2, Seamie Heffernan's mount travelled well in the race before hitting the front a furlong-and-a-half from home and holding off Pierre D'Or by a head.
Boomakers finally got some relief in the second division, which went to 14/1 outsider Alvar, completing a double for Halford and Foley.