Sergej Milinkovic-Savic completed a second-half turnaround as Lazio secured what could be a crucial win in the Serie A title race by beating Inter 2-1 at the Stadio Olimpico.
Lazio fell behind to Ashley Young's first goal since joining Inter in January but rallied after the restart to hand Antonio Conte's side, who went into this weekend top of the table, their first top-flight defeat in 17 matches.
Inter centre-back Stefan de Vrij, whistled incessantly by fans of his former club, was deemed to have fouled Ciro Immobile in the box and the prolific striker made no mistake from the spot five minutes into the second period.