Joaquin Correa gave Lazio the lead over Milan within 77 seconds, but Manuel Lazzari saw a second goal narrowly ruled offside.
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This was a crucial head-to-head clash for Champions League places, both teams coming off costly midweek defeats. The Rossoneri needed a win to avoid losing second place to Atalanta. Zlatan Ibrahimovic was out injured, but Ismael Bennacer and Theo Hernandez returned, with Mario Mandzukic getting his first start in the Milan jersey. Simone Inzaghi returned to the touchline after several weeks out with COVID, but Felipe Caicedo, Gonzalo Escalante and Luiz Felipe missed out
It took 20 seconds for the first shot on goal, Pepe Reina parrying the Hakan Calhanoglu strike with one hand.
However, moments later Lazio took the lead with just 77 seconds on the clock. Joaquin Correa ran onto a flicked Ciro Immobile through ball, dribbled around Gianluigi Donnarumma and deposited into the empty net.
The Rossoneri were badly shaken and almost conceded another when Donnarumma made a desperate reaction save on Correa from close range after a free kick was not cleared.
Milan got back on their feet following the early shock, Calhanoglu forcing another one-handed save from Reina, but he hesitated and should’ve taken the chance earlier.
Alexis Saelemaekers provided the assist there and went for goal himself soon after, a curler smothered from the edge of the area.
Theo Hernandez blasted over the bar, but just as Milan were pushing for an equaliser, Manuel Lazzari sprinted away on a through ball and beat Donnarumma one-on-one. However, VAR confirmed Lazzari was inches offside in the line with Simon Kjaer.
Milan threatened an equaliser in first half stoppages, as Calhanoglu and Saelemaekers flicked on passes for Mandzukic’s volley, well saved by Reina.
Lazio 1-0 Milan (Half-Time)
Correa 2 (L)
Lazio: Reina; Marusic, Acerbi, Radu; Lazzari, Milinkovic-Savic, Leiva, Luis Alberto, Lulic; Correa, Immobile
Milan: G Donnarumma; Calabria, Kjaer, Tomori, Theo Hernandez; Bennacer, Kessie; Saelemaekers, Calhanoglu, Rebic; Mandzukic
Ref: Orsato