Lucayan, untested in group stakes competition, upset the Group 1 Poule d’Essai des Poulains (French 2000 Guineas) on Sunday at Longchamp in Paris.

Fast-closing third-place finisher Furner’s Green, trained by Aidan O’Brien and ridden by Joseph O’Brien, broke a foreleg after the finish and had to be euthanized. The horse’s rider fell but was reportedly uninjured.

Black Caviar is bound for Royal Ascot in June with an undefeated record after 21 starts.

Saturday in Australia, Black Caviar won her final start of the Australian season with an easy score  in the Group 1 Goodwood Stakes at Morphettville Racecourse in Adelaide.

Sunday’s Group 1 Poule d’Essai des Poulains (French 2000 Guineas) on Sunday at Longchamp brings about a rematch between Dragon Pulse and 2-year-old star Dabirsim – with a touch, of course, of Aidan O’Brien thrown in.

Mickdaam won the Group 3 Chester Vase on Thursday in England by a nose, but his victory barely registered in ante-post betting for the Epsom Derby.

The undefeated Australian star Black Caviar has a fan in trainer John Shirreffs, a man who knows a thing or two about managing a mare on a winning streak.

Last month, Shirreffs watched on television as Black Caviar stretched her unbeaten streak to 20 races with a comfortable win in the Sportingbet Classic at Morphettville Racecourse, near Adelaide, Australia.

The Irish invaders Call to Battle and David Livingston, both stakes winners last year at 2, are expected to dominate Thursday’s Group 3 Chester Vase at Chester Racecourse in England.

The Chester Vase, run over about 1 1/2 miles on turf for 3-year-old colts and geldings, is a prep for the English Derby at Epsom Downs on June 2.

Homecoming Queen, who finished last of 14 in the Breeders’ Cup Juvenile Fillies at Churchill Downs last November, pulled a shock upset in Sunday’s English 1000 Guineas at Newmarket Racecourse, leading throughout the one-mile race.

Homecoming Queen gave Irish trainer Aidan O’Brien a sweep of the English 1000 and 2000 Guineas. He won Saturday’s 2000 Guineas with Camelot, the future-book favorite for the English Derby in June.

Trainer Aidan O’Brien scored the sixth English 2000 Guineas victory of his career with favored Camelot on Saturday at Newmarket, but this was the first O’Brien winner ridden by his son, 18-year-old Joseph.

Maybe, a Galileo filly unbeaten in five starts but unraced since August, will be heavily favored to win Sunday’s Group 1 English 1000 Guineas for 3-year-old fillies at Newmarket racecourse.

Trained by Aidan O’Brien for the partnership of Derrick Smith, Michael Tabor and Sue Magnier, Maybe won four consecutive stakes to end her 2011 campaign, including the Group 1 Moyglare Stud Stakes in Ireland last August. She was the joint champion 2-year-old filly of 2011 with Elusive Kate.

Aidan O’Brien has 30-1 shot Daddy Long Legs for Saturday’s Kentucky Derby, but about five hours earlier at Newmarket he’ll saddle the hot favorite Camelot for the Group 1 English 2000 Guineas.

Camelot is one of 18 horses in the first European classic race of the season, a one-mile tilt up the famed Rowley Mile course at Newmarket. England has been waterlogged this spring, but the Newmarket course has dried somewhat in recent days and is forecast to be on the soft side of good Saturday.