What are the odds that Justify can win the Triple Crown?

Justify has won the Triple Crown.  He's the 13th horse to ever win all three races ... Kentucky Derby, Preakness, and the Belmont Stakes.  Amazing!

Justify winner of the Kentucky Derby and the Preakness

How do you calculate compound probability?  Skip the betting odds and deal only with the odds that one horse could win 3 amazing races.  June 9th is the Belmont Stakes race ... the last race in the Triple Crown.  Can Justify beat the odds?