Fresh from saddling the first-race winner on Thursday, Tom Tate repeated the trick on the final day of Chester's May meeting as his Celtic Sultan made all in the Warwick International Handicap.
Micky Fenton soon had the 7-1 chance bowling along at the head of affairs and his mount kept finding under pressure to get home by a neck from the unlucky-in-running Extraterrestrial.
Tate said: "I hoped he had improved a bit over the winter and he did that quite smoothly.
"He will have to go up to Listed class now and we'll give him the chance to improve.
"He is very similar to my Welsh Emperor and is a real stiff six-and-a-half to seven furlong horse."
Macarthur justified favouritism at 9-4 when running out a convincing winner of the Blue Square Ormonde Stakes.
Trained by Aidan O'Brien and ridden by Johnny Murtagh, the four-year-old was settled just behind the leaders until kicking into top gear rounding the home turn.
Macarthur took over with a little over a furlong to run and lengthened takingly to inflict a four-length defeat on 22-1 chance Supersonic Dave.
Carte Diamond made much of the running and stuck on well for third, while John Gosden's Raincoat had to snatch up badly when running into trouble late on.
Murtagh said: "Aidan said he had improved a lot from his run at the Curragh and he suited the track - he's got plenty of gears.
"When we got to the false rail it opened up and for a horse to quicken like that at the end of a mile and five, he must be a nice horse.
"The ground has been very bad this spring but he loved the ground here today and he's a high-class horse. I think he has a big future.
"He's got the pedigree, he's a full brother to Motivator so hopefully he can win a Group One like him."
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