The Brazilians were confirmed for the annual glamour friendly as part of the transfer agreement that saw Neymar move to the Catalan giants in June.
But they were hopelessly exposed by a strong Barça side as two goals from Cesc Fabregas, allied to further strikes from Lionel Messi, Alexis Sanchez, Pedro, Adriano, Jean Marie Dongou and an own goal from Leo made it a comfortable evening for the hosts.
However, the biggest cheer of the night was reserved for Neymar when he made his bow at half-time. The 21-year-old made a positive impression despite failing to get on the scoresheet himself as he teed up Fabregas' second and Barça's sixth of the night 20 minutes from time.
Martino, who has succeeded cancer-stricken Tito Vilanova, named a strong side on his own first home outing as the club's new boss with the likes of Xavi, Andres Iniesta, Serio Busquets and Dani Alves starting for the first time in pre-season following their participation in the FIFA Confederations Cup.
It didn't take the hosts long to get into their stride though as Pedro fed Messi to fire home the opener from a tight angle after just eight minutes.
Leo could then only turn a dangerous cross from Alves into his own net three minutes later and Barça were three up inside 22 minutes when Messi unselfishly set up Sanchez to roll the ball just inside the far corner.
Pedro made it four just moments later when he turned home Jordi Alba's low cross, and with the game comfortably sewn up, Martino made eight changes at half-time.
Fabregas was one of those introduced at the break and he made it five just seven minutes after the restart with a composed finish from Sanchez's pass.
And Fabregas was involved again as he presented 18-year-old Dongou with an open goal to round off the scoring seven minutes from time.