Lionel Messi's debut was everything MLS could hope for, but what happens next is what counts most

Lionel Messi's first days in MLS have been a dream for the league. Now, MLS' greatest challenge -- and a crucial step their predecessors failed to accomplish -- is building off of the superstar’s buzz-making arrival. Messi's last-minute, game-winning free-kick goal in his Inter Miami debut against Cruz Azul Friday night nearly seemed scripted with...