Question: Who is the league top scorer in the 1990-1991 U.C. Sampdoria season currently a commentator for?
Sentence (from "1990–91 U.C. Sampdoria season"): Gianluca Vialli was the league top scorer on 19 goals, and Roberto Mancini, Attilio Lombardo, goalkeeper Gianluca Pagliuca plus centre half Pietro Vierchowod were also instrumental in Sampdoria's success story.
Relevant evidence: Yes