Players get to retry as many times as they want until the boss is beaten. Poor bosses.
I'm not necessarily saying that TP Ganondorf is a difficult boss (though in human Link's case...), but think of a difficult boss/level as your rival. When you finally beat 'em, the record is something like 1-(a big number).
Fortunately, that doesn't matter because you only need to triumph over the obstacle once. Then you'll be on your way!
~Triforce of Courage sweatshirt ftw