MILAN, March 31 — AC Milan strengthened their grip on second place in Serie A yesterday with a hard-fought 2-1 win at Fiorentina after an Adam Marusic header sunk Juventus in the final seconds at Lazio.

Stefano Pioli’s side closed the yawning gap separating them from runaway league leaders Inter Milan, who host Empoli on Easter Monday, to 11 points with well-taken goals early in the second half from Ruben Loftus-Cheek and Rafael Leao.