Joseph O'Brien admitted his father kept the decision to run filly Tuesday in this weekend's Dubai Duty Free Irish Derby a secret until the last minute, writes James Toney.
Tuesday will look to become the first filly since Balanchine in 1994 to win the race, who also won the Epsom Oaks before scoring at the Curragh.
"It'll be great to see the filly and colt (Tuesday and Westover) clashing at the Curragh, they look like two top notches," he told Racing TV.
"I didn't know until Monday and I thought it was fantastic and brilliant for the race."
O'Brien, whose Royal Ascot winner State of Rest was yesterday moved to the top of the world rankings following his impressive Prince of Wales's Stakes success last week, has three entries in the race, with Hannibal Barca appearing his pick. He won the Irish Derby as a jockey on Camelot and Australia but is still waiting for his first win as a trainer.
Hannibal Barca won over a shorter distance at the Curragh last month on his seasonal reappearance, having finished a narrow fourth in last year's Group One Vertem Futurity Trophy at Doncaster.
"He's not a slow horse but we think the 12 furlongs will suit him," he added.
Moore looks to complete the Classic jigsaw
Ryan Moore is looking for a piece of history as he attempts to achieve a rare feat and complete a full set of Irish and British Classics.
The list of jockeys to have completed the feat is small, Lester Piggott achieved it but Steve Cauthen never won the Irish 2000 Guineas and Frankie Dettori is still waiting on his first win in the Irish Oaks.
He has been close before, famously when Pat Smullen edged him on the line on Dermot Weld's Harzand in 2016.
"It's one of the big races of the season and they are the ones you want to be competitive in," he said. "I've had chances before but you just have to keep putting yourself in contention."
Carson's backs girl power at the Curragh
British jockey Willie Carson won the Irish Derby twice - including on filly Salsabil in 1990.
So perhaps it's no surprise he likes the chances of Aidan O'Brien's Tuesday this weekend.
"If she's going to improve, the boys are in trouble! Tuesday is the one I'd like to be riding," he told the Racing Post.
Dunlop looks for sunshine, not showers
Looking ahead to Sunday's Group One Alwasmiyah Pretty Polly Stakes, British trainer Ed Dunlop won't like the weather forecast today.
The Curragh reported the possibility of 20mm of rain ahead of the race, with the ground currently 'good, good to firm in places'.
Dreamloper has won both her starts this season and looks the best of the Brits against home hopes, Joseph O'Brien's Prix Saint-Alary winner Above The Curve and Paddy Twomey's La Petite Coco.
"We're keeping an eye on it, we don't want it to get too soft and I know some rain is forecast," said Dunlop. "It's the plan and she's in good shape."