Feb. 28, 1957: John Longden became the first jockey in history to reach 5,000 victories.
March 1, 1969: Tuesdee Testa, 27, became the first female jockey to win a race at a major American Thoroughbred track when she won the third race at Santa Anita Park aboard Buz On.
March 1, 1991: Pat Day, 37, became the sixth rider in history whose mounts earned $100 million when he rode Wild Sierra to a second-place finish in the first race at Oaklawn Park.
March 2, 1940: Beaten by a nose in both the 1937 and 1938 Santa Anita Handicaps, Seabiscuit finally won the Big 'Cap in his final race. He retired the then-leading money-winning horse in the world.
March 2, 1966: Kelso, Horse of the Year 1960-64, ran his last race, finishing fourth at Hialeah Park.
March 3, 1966: Ogden Phipps' Buckpasser won the Flamingo Stakes by a nose, under the guidance of Bill Shoemaker. The colt was such a prohibitive favorite among the field of nine that the race was declared a non-wagering contest and was dubbed "The Chicken Flamingo."
March 3, 1985: Bill Shoemaker became the first jockey in history to win $100 million in purses after he won the Santa Anita Handicap aboard Lord at War (ARG).
March 3, 1993: Russell Baze had his 4,000th career win, with Frank Musso, at Golden Gate Fields.
March 5, 1988: Carl Gambardella had his 5,000th career winner, aboard John's Goldenapple, at Suffolk Downs.
March 6, 1965: Jockey Earlie Fires rode his first winner, Carnation Kid, at Oaklawn Park. By year's end, Fires had amassed nearly $600,000 in purse earnings to earn the title of champion apprentice jockey.
March 6, 1988: Julie Krone became the winningest female jockey in racing history when she won the 1,205th race of her career riding a filly named Squawter in the ninth race at Aqueduct Racetrack.
March 8, 1987: Carrying 126 pounds, Zany Tactics set the world record for six furlongs, 1:06 4/5, at Turf Paradise. On Feb. 21, 1993, his time was equaled by Honor the Hero, also at Turf Paradise.
March 8, 1985: Chris McCarron rode his 4,000th career winner, Hawkley (GB), in the fifth race at Santa Anita Park.
March 9, 1977: Seattle Slew made his three-year-old debut, at Hialeah. He won a seven-furlong race in 1:20 3/5, breaking the track record.
March 10, 1808: Diomed, the winner of the inaugural Epsom Derby in 1780, died in Virginia at age 31. He had been imported to the U.S. 10 years earlier and subsequently became an influential sire.
March 10, 1993: At age 41, jockey Eddie Delahoussaye had his 5,000th career winner, aboard Ackler in the fifth race at Santa Anita Park. He was the 14th rider in North American Thoroughbred racing to reach that plateau.
March 11, 1943: After siring 350 foals that won over $3 million, 26-year-old Man o' War was retired from stud duty.
March 12, 1966: In the last race of his 40-year career, John Longden won the San Juan Capistrano Handicap at Santa Anita Park, aboard George Royal. He retired with a then-record number of victories, 6,032.
March 12, 1998: The National Thoroughbred Racing Association and EquiSource reached an agreement in principle for EquiSource to be the exclusive provider of group-purchasing and productivity services for the Thoroughbred racing industry.
March 13, 2000: According to the ESPN Sports Poll, consumer interest in Thoroughbred racing increased by 3.1 percent among people 18 and older during the previous two years.