Lazio and Atalanta drew 2-2 at Rome's Stadio Olimpico on Wednesday in the first leg of their Italian Cup semi-final.
The hosts took the lead at the start of the second half and again in the closing stages with goals by midfielder Fisayo Dele-Bashiru and substitute striker Boulaye Dia.
But the visitors from Bergamo quickly came back both times thanks to Mario Pasalic and Yunus Musah.
The other semi-final is also finely balanced as Serie A leaders Inter were held 0-0 at Como on Tuesday.
The return legs take place next month.
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