Juventus striker Gonzalo Higuain punished his former club with an early goal in a 1-0 win at Serie A leader Napoli on Friday that tightened the title race.
Playing with a broken left hand that was operated on four days earlier, Higuain took a pass from Paulo Dybala and finished off a swift counterattack with an accurate shot inside the near post past charging goalkeeper Pepe Reina.
Six-time defending champion Juventus moved ahead of Inter Milan into second place and within one point of Napoli, which was handed its first loss of the season.
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Conceding a goal to Higuain was particularly painful for Napoli. Two seasons ago, the Argentina international scored 36 goals for Napoli to break a 66-year-old Serie A record. Then he transferred to Juventus for an Italian-record 90 million euros ($100 million) and he has now scored five goals in five matches against Napoli.
Earlier, fourth-place Roma beat 10-man Spal 3-1.
Inter can take the lead with a win over Chievo Verona on Sunday.