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A double-bogey six at 15 could have been worse after Molinari, playing alongside his brother Francesco and Clarke in the final group, found trouble way right off the tee, but he regained his composure after a fortunate drop limited the damage to just two shots.
To Clarke's credit - his second place getting him into this week's Open at St Andrews - he never gave up and cut the gap to two shots on 17 after a neat birdie to Molinari's safe par.
But, there was to be no stopping the Italian, who now moves from 11th to sixth in the world list for Colin Montgomerie's Ryder Cup team, and another safe par on 18 meant that the Molinari brothers became only the third brothers to lift Tour titles - just eight months after they won the World Cup in China.
Clarke's challenge was made all the more difficult on the third when he tried to play his ball out of the water but needed three attempts, which ultimately proved costly.
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