Ballynagour made amends for his eclipse as favourite last year when winning the Byrne Group Plate at the second attempt at the Cheltenham Festival.
David Pipe's charge was sent off the 7-2 market leader in 2013 but could finish no better than eighth in the hands of Tom Scudamore.
However, Ballynagour righted the record in style as he laughed at his rivals in winning by eight lengths from Colour Squadron.
Ballynagour made stealthy progress through the field and was noted travelling particularly well at the top of the straight, sitting in behind the well-fancied Third Intention, with Colour Squadron also on the bridle.
When Ballynagour made his move Colour Squadron had no answer and was left toiling as Tatenen took third and Johns Spirit fourth.
Scudamore and Pipe were completing a double after their earlier Ryanair Chase success with Dynaste.
Scudamore said: "I really enjoyed that, it was fantastic.
"We always knew this horse had so much ability but he just wasn't finishing his races. He did today.
"He'd had bleeding issues so David has done an incredible job again, what a master.
"I'll enjoy today and see what tomorrow brings, I've got four reasonable chances tomorrow including The Giant Bolster in the Gold Cup."
Pipe said: "When he's good he's very good, as he showed when he won at Warwick.
"He's bled on occasions, so we don't do much with him and just give him an easy life.
"I probably shouldn't have run him here at the Paddy Power meeting, he wasn't fit enough at the time.
"Fair play to the owner, he was happy for us to bring him here fresh.
"I'm not sure what we'll do now, he's not a horse that takes too many runs so I don't think we'll be in a rush to do anything other than watch the DVD a few times."