Your greatest rivalry can end with both versions of you winning.

Rivalry with other people has a loser built in. Rivalry with yourself does not, because the version you surpass was the one that got you here, and the version doing the surpassing was built out of them. Nobody is diminished. The whole contest is additive.

When you beat an old mark, resist dismissing the person who set it. They did the work that made this possible. Holding both is what keeps the competition motivating rather than corrosive.