Inter's winning start to the Serie A campaign was halted by Lazio on Sunday, with both Ciro Immobile and Stefano Sensi sent off.
Lazio's hopes of a comeback were dented in the 69th minute as Immobile, who managed just one shot from 26 touches in a frustrating individual display, saw red for slapping Arturo Vidal.
Inter almost snatched the points in the closing stages when Marcelo Brozovic struck the woodwork, before Nerazzurri substitute Sensi received his marching orders for hitting Patric.
Ciro Immobile and Stefano Sensi both saw red as Inter were held to a 1-1 draw by Lazio in an ill-tempered Serie A clash at Stadio Olimpico.
Lautaro Martinez kept up his fine start to the season to open the scoring in the 30th minute of Sunday's clash, lashing in a shot which Thomas Strakosha failed to keep out.
But with Romelu Lukaku wasting a chance to double Inter's lead, Sergej Milinkovic-Savic's brilliant header restored parity.