Juventus broke away six points clear of Napoli, as Douglas Costa came off the bench and provided a hat-trick of assists to beat Sampdoria 3-0.
The Bianconeri struggled to push through the Samp wall in the first half, but within a minute of replacing injured Miralem Pjanic, Douglas Costa made the difference.
He whipped in a cross for Mario Mandzukic to volley off the inside of the right boot on the stroke of half-time.
After the break, the Brazilian continued to create goals for former Bundesliga stars, as he floated in the perfect ball for a Benedikt Howedes diving header and dribbled past defenders to pull back for Sami Khedira to prod in from nine yards.
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