Dries Mertens finished off a well-worked team move to give Napoli the 1-0 pre-season victory away to Olympique Marseille.
Piotr Zielinski pulled out of this friendly match after a bout of flu, so summer signing Elmas was given his first start in midfield and made a very good impression at the Stade Velodrome.
Lorenzo Insigne wasted a golden opportunity 10 minutes in, firing straight at the goalkeeper on an Elseid Hysaj cross, while Fabian Ruiz and Radonjic skimmed the woodwork.
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