If they win, instead the firms could simply give them the rights to remove their data, which honestly none of them would exercise. Not being in the professional sports statistics databases is worse, even for poorly performing players, as it implies that aren't famous or noteworthy enough to be included. Under GDPR a person doesn't get to cherry pick which data to delete right? Either you request all your data to be deleted by a firm or you don't, right?

GDPR clearly needs an exemption for anything that is already publicly available data.