Filippo Melegoni put the visitors ahead in under nine minutes when he cut in from the left and smashed the ball in off the underside of the crossbar with his right.
Mattia Valoti equalised for Pisa in the 16th minute when he converted a penalty awarded for handball.
Janis Antiste made it 2-1 for Reggiana in the 34th minute with a header from an angle into an empty net after Pisa goalkeeper Nicolas completely misread the situation and allowed the ball to bounce past him.
Nicholas Bonfanti levelled for the home team in the 82nd minute after Ernesto Torregrossa put him through on goal. Bonfanti’s finished went between Reggiana goalkeeper Francesco Bardi’s legs.
Both teams sit midtable and can’t afford too many losses from here if they’re to make the playoffs.
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