Napoli survived a spirited fightback from bottom side Crotone to earn a 4-3 win and go fourth in Serie A on Saturday, as the fierce battle for Champions League qualification continued.
Lorenzo Insigne and Victor Osimhen struck for the hosts before Simy pulled one back, but Dries Mertens' free kick restored Napoli's two-goal cushion before the break.
The visitors launched a comeback in the second half as Simy prodded in his second before Junior Messias curled in a stunning equaliser in the 59th minute.
Nigeria international Simy's double continued a superb run of form that makes him the top scorer in Europe's top-five leagues since the start of March with eight goals.
But the relegation battlers could not hold on as Giovanni Di Lorenzo rifled in a shot to put Gennaro Gattuso's side back in front after 72 minutes.
Napoli climbed one point above Juventus, who face Torino later on Saturday, into fourth place on 56 points, but they remained two points behind Atalanta in third after the Bergamo club beat Udinese 3-2.