Mainbrace was a champion New Zealand Thoroughbred racehorse who won 23 of his 25 race starts and was placed second in the other two.

Notably the two losses were to the same horse, The Unicorn, who he beat on other occasions.

When he broke down he had won 17 races in succession, which was only two behind Gloaming and Desert Gold's Australasian record.

[3] His daughter, Topaz produced Chimbu who won the Auckland Cup and ARC Queen Elizabeth Handicap.

[4] In 2008 Mainbrace was inducted into New Zealand Racing Hall of Fame.