In February, at Flemington racecourse in Melbourne, Australia, I witnessed the champion racehorse "Black Caviar" win her 23rd-successive race (also breaking the course record for 1000 metres). The horse retired two months later - undefeated in 25 races. Technically, this photograph is not remarkable, but it captures a piece of sporting history.
https://en.wikipedia.org/wiki/Black_Caviar
(February 16, 2013. Nikon D5000, 1/1000s @ f/5.6, 300mm, ISO 250.)