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Canada striker David guided home from Kenan Yildiz's low cross in the 59th minute to send Juve on their way to three points at the Allianz Stadium in Turin.
The 25-year-old was brought in as a free agent to help boost an attack which had for too long been let down by misfiring Dusan Vlahovic, and David showcased the goalscoring instincts which made him a hero at Lille.
But it was Vlahovic, who is reportedly on the transfer list at Juve, who made sure of the win near the end of an uninspiring contest when he tapped home from close range with six minutes remaining.