Gonzalo Higuain gave visitors the lead after 15 minutes with a smart finish . There was a suspicion of handball as the Argentine brought the ball down . Marek Hamsik doubled lead on 23 minutes , Higuain the provider . Slovakian midfielder added his second and Arsenal 's third in second half . Manolo Gabbiadini added a fourth for visitors moments after coming on . Former Napoli striker Nicklas Bendtner pulled one back for the hosts .
Gonzalo Higuain gave visitors the lead after 15 minutes with a smart finish . There was a suspicion of handball as the Argentine brought the ball down . Marek Hamsik doubled lead on 23 minutes , Higuain the provider . Slovakian midfielder added his second and Napoli 's third in second half . Manolo Gabbiadini added a fourth for visitors moments after coming on . Former Arsenal striker Nicklas Bendtner pulled one back for the hosts .