The son of Danehill was supported from 4-6 to 1-2 and then, when depositing Michael Kinane on the way to the start, he eased back to 4-7.
Explained Kinane: "He saw telephone lines as we went down and thought he had to go under them. He jammed on and I could do nothing about it.”
Devil Moon was quickly caught and Kinane, though shaken, soon restored the partnership.
Then on the track the winner found it hard to get an opening, as Chained Emotion and De Tiger blazed the trail. Over a furlong out, Kinane had to switch and Devil Moon found a real turn of foot in the closing stages to beat De Tiger by a head with Chained Emotion only a neck away in third.
Commented O’Brien: "He was very green the first day at Cork. He’s a fast horse and the better the ground the more he would appreciate it.”
John Oxx’s Ebatana was a costly failure in the EBF Fillies Race.
Always a strong favourite, she tried to make every yard. But Ebatana had no more to give at the furlong pole, as Declan McDonogh drove Jakarta Jade past.
Crimphill, who lost her place heading to the straight, stayed on again late, but the winner held her by half a length.
Said trainer, Kevin Prendergast: "All being well Jakarta Jade will now go to Chester for the Cheshire Oaks.
"We came here to see if she gets the trip, there would be no point travelling if she didn’t.”
McDonogh completed a double when giving Eddie Lynam’s 14-1 shot Open Handed a strong drive to win the Pallasgreen Handicap.
Open Handed edged on inside the furlong pole and held on for dear life to hold favourite, Lucky Largo, 7-4 from 5-2.
The son of Cadeaux Genereux, who cut little ice previously in decent Curragh maidens, paid a whopping 94-1 on the Tote.
Some major wagers went west on Dermot Weld’s Faadhil in the Junction Race, as he hardened from 11-8 to 4-7. The money stayed firmly in the satchels, however.
He tried to make all, but cried enough at the furlong pole. Flamelet, a John Oxx newcomer, and Plume Rouge swept on and it was the first named who stayed on best to score by a head.
Said Oxx: "She’s light and leggy and hadn’t been asked for much at home. We weren’t expecting her to be at her best today.
"Obviously, she’s got some ability. The plan next time was a maiden, but we will have to think of something else now.”
Bookmakers, who had the best of the battle, got a screamer in the EBF Fillies Maiden with victory going to Dermot Weld’s outsider, and first-timer, Sissy Slew.
The American-bred, partnered by Pat Shanahan and one of three runners in the contest for Weld, powered into the lead with over a furlong to go to hold John Oxx’s ‘second string’, Bernhardt, by a short head.
Oxx also supplied the well-backed market leader, Prayer. Johnny Murtagh had her near the front from the start, but it wasn’t too far into the straight when her supporters knew they hadn’t a prayer.
Jim Gorman continued his good start to the campaign when Fair Replacement took the five furlong Tipperary Handicap. He was driven ahead over a furlong out by Tadgh O’Shea and though Musical World made up several lengths the four-year-old was still a neck adrift at the line.