Napoli shares spoils with Genoa
Napoli appeared to be heading for all three points after Gonzalo Higuain gave it the lead in the 18th minute.
The Argentina forward timed his run to perfection and chipped a delightful through ball from Marek Hamsik over Genoa goalkeeper Mattia Perin for his 13th league goal of the season.
However, Calaio curled a free kick into the top right corner six minutes from time. He apologized to the home fans.
''I'm sorry to have scored a goal against Napoli itself. I had important spells there,'' Calaio said. ''When the manager gives me the opportunity I try to give my all for this shirt, our fans deserve it. I dedicate the goal to my family and my son.
''It's the third goal in my career I've scored from a free kick, I'm sorry to have scored at the San Paolo, but that's my job and I hope to score in the next games too.''