Sacked Italy manager Luciano Spalletti bowed out with a victory after his side laboured to an uninspired 2-0 home win over Moldova in their World Cup qualification match on Monday.
Martinez struck inside two minutes before Domenico Berardi equalised, but Lukaku gave Inter breathing space with a powerful strike and a penalty before half time.
Juventus moved nine points clear at the top of Serie A after defeating Palermo 4-0 at home on Sunday and Francesco Totti bagged a dramatic late equaliser as AS Roma drew 3-3 at Atalanta.
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Fellow Serie A sides Atalanta and Lazio also won while Portugal's Vitoria Guimaraes began their match against Salzburg with not a single European player in the team.
Lazio survived a storming Napoli fight back, including a missed penalty, as they won 4-2 on Sunday to finish third in Serie A and qualify for the Champions League playoff round after both teams finished with 10 men.
A young Arnold Schwarzenegger in swimwear, Cary Grant setting airport chic standards, a socialite even the Kardashians can't keep with and other vintage moments from the film festival on La Croisette!
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