All the latest news on a huge day in Britain and Ireland
Don't blink! The fastest horse in Europe makes his reappearance at Haydock this afternoon.
Champion five-furlong sprinter Battaash has his first run since that memorable Prix de l'Abbaye victory last autumn, in the Group 2 Armstrong Aggregates Temple Stakes at Haydock (4.00).
But the day's only Group 1 race is the Tattersalls Irish 2,000 Guineas at the Curragh, where Newmarket fourth Elarqam and sixth Gustav Klimt renew rivalry in a race that Aidan O'Brien has won in seven of the last ten years.
There is also racing at Cartmel, Chester, Goodwood and York in the afternoon, with evening action at Ffos Las and Salisbury.
Chester (first race at: 1.45)
Good (GoingStick: 7.0 at 14.00 on Friday)
Good, Good to Firm in Places (Straight); Good to Firm (Round)
Good (Going stick: 6.5 at 10.00 on Friday)
Good (Going stick: 7.1 at 6.00 on Saturday)
Good (Going stick: 6.9 at 6.00 Saturday)
Good, good to soft places on back straight (Going stick: 8.2 at 06.30 on Saturday)
Good, good to soft in places (Going stick: 7.4 at 6.15 on Saturday)
Ffos Las (6.05)
Good, good to soft in places (Going stick: 7.5 at 6.30 on Saturday)
2.15 Haydock Euchen Glen 5-1 (from 7s)
2.35 York Across The Stars 5-1 (from 9s)
3.15 Cartmel Sam Noir 8-1 (from 14s)
4.40 Chester Heart Of Soul 4-1 (from 6s)
What to back
A couple of sprinters to look out for at Haydock
What to read
A classic weekend began on a low note for John Gosden
Good news for ITV Racing
Thousands of pounds of damage done at Thirsk
What to watch
How to train a Derby winner
All you need to know if you fancy a bet today
And if you want to play up your winnings on Sunday
The best of Racing Post Sport
All you need to know ahead of a cracking Champions League final is here
Michael Owen knows what he's talking about as he played for both Liverpool and Real Madrid.
Top-class Flat action is where the money is but those who like a bit of fun with their racing will be delighted to see the start of the season at Cartmel, where the funfair is ever present and the course website stresses: "Picnics and dogs welcome as always."
For the freshest betting advice, based on latest going and market conditions, don't miss the Live Tipster every afternoon. Just click Raceday Live at racingpost.com or the mobile app