List of leading Thoroughbred racehorses

The list of leading Thoroughbred racehorses contains the names of undefeated racehorses and other horses that had an outstanding race record in specific categories. Note though that many champions do not appear on the list as an unexpected defeat may be caused by many factors such as injury, illness, going, racing tactics and differences in weight carried, the latter being particularly significant in North America and Australia where handicaps are common even at the highest level of racing.

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