The forward came off the bench to score for the Midlands club against Bayern Munich in the Champions League.
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The 1-0 win means Villa are in a great spot in the new, large group stage format of the competition.
Post-game, Martinez told reporters about Duran: "He came back with a different mentality this season.
“He's willing to work hard, he's pushing Ollie (Watkins) all the way, they can play together he's a super sub.
“The first time he touched the ball, he lobbed Neuer, one of the best goals in history.”