Which was the last favourite to win the St. Leger?

Since the turn of the twenty-first century, no fewer than ten favourites – including Rule Of Law, who started joint-favourite in 2004 – have won the St. Leger.. Ironically, the shortest-priced favourite in that period – and, in fact, the shortest-priced favourite since Reference Point in 1987 – Camelot failed to justify odds of 2/5 when beaten three-quarters of a length by 25/1 outsider Encke in 2012. Camelot was attempting to become the first horse since Nijinsky, in 1970, to win the Triple Crown, but ran below his best and was easily seen off in the closing stages.

To answer the question, though, the last favourite to win the St. Leger was Logician, trained by John Gosden and ridden by Frankie Dettori, in 2019. Hitherto unbeaten, the Frankel colt had little trouble justifying odds of 5/6, readily asserting in the closing stages to win by two and a quarter lengths. Logician subsequently received treatment for peritonitis – a potentially life-threatening infection of the stomach lining – but fully recovered and remains in training as a four-year-old.