Luka Doncic and Madelyn Cline can officially be crossed off the rumored couples list ... 'cause TMZ has learned there's absolutely nothing going on between them.
Sources familiar with the situation tell TMZ ... they're not dating, and to take it a step further, they've never even met each other.
The speculation started after fans noticed the NBA superstar and the "Outer Banks" actress followed each other on Instagram, sparking romance rumors amid Luka’s recent split from Anamaria Goltes.