Racing fans witnessed two outstanding performances as the five-day Royal Ascot at York meeting sprang into life.
The Ascot track is being redeveloped, with the Royal meeting moving for the first time in almost 300 years.
Shamardal won the opening Group One race - the St James's Palace Stakes - giving Australian jockey Kerrin McEvoy his biggest ever win.
Valixir landed a surprise by beating the favourite Rakti in the other Group One race, the Queen Anne Stakes.
1730 Chesham Stakes (Seven furlongs)
1. Championship Point (TE Durcan) 4-1
2. Global Genius (M Hills) 4-1
3. Crocodile Bay (SW Kelly) 9-1
Championship Point comes through late under the guidance of Ted Durcan to win the Chesham Stakes.
Durcan urged his mount through between horses in the last furlong to outpace the fast finishing Global Genius.
Crocodile Bay had looked most likely to triumph before being overcome by the winner and had to be content with third.
1655 Ascot Stakes (Two miles and four furlongs)
1. Leg Spinner (FM Berry) 9-1
2. Golden Quest (Greg Fairley) 12-1
3. Coconut Beach (K Fallon) 11-2
4. Ski Jump (P Hanagan) 25-1
20 ran. Dist: hd, 5
Leg Spinner and Golden Quest fight out a dramatic finish to the day's longest race, the Ascot Stakes.
Leg Spinner, ridden by Fran Berry and trained by Tony Martin, came over from Ireland and emerged victorious to give the trainer his second win in the race.
But he was made fight all the way to the line by Golden Quest, ridden by 7lb claimer Greg Fairley who narrowly failed to claim an Ascot success.
The pair were well clear of third-placed finisher Coconut Beach, ridden by Kieren Fallon.
1620 Queen Anne Stakes (one mile)
1. Valixir (C Soumillon) 4-1
2. Rakti (P Robinson) 5-6f
3. Starcraft (D Holland) 7-1
Valixir, ridden by Christophe Soumillon and trained by Andre Fabre, takes advantage of a temperamental display by the favourite Rakti to land the Queen Anne Stakes.
Rakti had bolted away before the pre-race parade and although jockey Philip Robinson brought his mount under control, there were still question marks about how much it had taken out of him.
Although Rakti looked lively early on, Valixir took up the running with two furlongs to go and although he tired coming to the line, he was still able to hold off the challenge of the favourite.
1545 St James's Palace Stakes (one mile)
1. Shamardal (K McEvoy) 7-4f
2. Ad Valorem (MJ Kinane) 8-1
3. Oratorio (K Fallon) 13-2
8 ran. Dist: 3, 1¾
Shamardal controlled matters from start to finish to record a comfortable three-length win in the day's first Group One race.
The Godolphin stable only opted to run Shamardal rather than stablemate Dubawi earlier on Tuesday afternoon but the decision paid dividends to give Australian jockey Kerrin McEvoy the biggest win of his career.
This year's French 2000 Guineas and Derby winner set the pace right from the start and when he quickened with about three furlongs to go, nobody else could cope with the pace.
Ad Valorem and Michael Kinane ran on well from the back for second on his reappearance while his stablemate Oratorio, ridden by Kieren Fallon claimed third.
1505 King's Stand Stakes (five furlongs)
1. Chineur (C-P Lemaire) 7-1
2. Boogie Street (R Hughes)16-1
3. Moss Vale (M Hills) 14-1
16 ran. Dist: 1¾, 1
Chineur lands a blow for France with success in the King's Stand Stakes for his fourth win in a row.
Jockey Christophe Lemaire, in his first ride at York, got away well on the four-year-old and overcame Boogie Street in the final furlong in a fast and furious sprint.
Boogie Street bounced back from a disappointing run at Salisbury earlier this week to stay on well for second ahead of Moss Vale and Cape of Good Hope.
1430 Coventry Stakes (six furlongs)
1. Red Clubs (M Hills) 11-2
2. Pacific Pride (R Winston) 66-1
3. Amadeus Wolf (N Callan) 9-1
14 ran. Dist: 1¾, 1½
Red Clubs gives jockey Michael Hills an impressive victory in the day's opening race.
Much of the early pace was set by long-shot Pacific Pride, wearing the colours of Andrea and Graham Wylie, and a shock looked on the cards.
But Hills took his mount, trained by his father Barry, into contention with around two furlongs left, forged to the front and held on for the first victory at the 2005 Royal meeting.
There is drama before the start of the race when Seb Sanders' mount Imperial Sword bolts down the track and has to be withdrawn.