What tennis shoe was originally made for a specific tennis player, but did not sell enough, so they made the shoe for an even more famous tennis player?

The first model of the "Stan Smith" was supposed to be a signature model shoe for the French tennis player Robert Haillet. Not many people bought the shoe. Adidas then asked Stan Smith to have the signature shoe, so he then had his signature shoe. Sales were much more successful than before because of how famous he was.