Balotelli then found Kaka just outside the box, but the Brazilian's effort was too central and was comfortably held by Marchetti.
Kaka had two more chances in quick succession, but both times put his effort well wide of the right-hand post.
Riccardo Montolivo was the next to test Marchetti, but his drive was well tipped over by the Lazio stopper.
The hosts were unable to create another chance before the break and somehow the sides went in at 0-0.
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However, just nine minutes into the second half Milan did break the deadlock and it was Kaka who fired into the top corner from range.
They could not hold the lead, though, as Michael Ciani scored with just under 20 minutes to go to grab a point for the away side.