Sampdoria have won their last 3 games - Torino, Bologna and Partizan Belgrade. However, they haven't been great opposition. Napoli, on the other hand, just had a great 3 win run against much better opposition (Juve, Lazio, Reggina (okay, they are shit too)) ended with an unlucky loss to AC Milan, a match in which they had 1 man sent off but defended well until they unfortunately conceded an own goal. Denis has been great for Napoli, and they have great youngsters in Hamsik and Lavezzi. Napoli have won all games at home and I don't think their run will stop here.
Roland's prediction: $5 on Napoli -0.5 @ 1.840 = $9.20