MADRID—When the final whistle blew, Diego Simeone broke out into a broad smile, laughed and breathed a sigh of relief. A few moments later, Luis Suárez was sitting on the field weeping profusely while on a video call. After a seven-year wait—and a dramatic final round—Atlético Madrid had won the Spanish league title. Fans and players later celebrated together outside the stadium in Valladolid, with more supporters rejoicing back in Madrid. Atlético outlasted second-place Real Madrid after coming from behind to defeat Valladolid 2–1 on Saturday and finish two points ahead of its city rival after almost losing a lead that it had held since the ninth round. Suárez, who was let go by Barcelona against his wishes last season, scored the winner for Atlético which won its first league title since 2014 in a wild finish that had plenty of twists with the two remaining title contenders playing at …