Andrea Orlandi warmed up for tomorrow night's return to Barcelona B by grabbing a superb winner to see of Palamos and secure the Swans their second Spanish tour success.
Orlandi struck in the 47th minute to register his first goal in Swansea colours.
Swansea arrived back at Estadi Municipal de Palamos, the venue of their opening game defeat to Espanyol for a 7.30pm (BST) kick-off.
This time they faced the home-town team, Palamos, who play their football in the Tercera Division (Group 5) - the fourth tier of Spanish football that will also host Espanyol B and Barcelona B next season.
Manager Roberto Martinez was expected to rotate his full squad again, but give his starting level 60 minutes of action instead of the normal 45 ahead of tomorrow night's final friendly against Barcelona B.
Definitely sitting it out though were Mark Gower and Ferrie Bodde who were given a night off.
Swansea City: de Vries, Tate, Painter, Monk ©, Williams, Britton, Tudur Jones, Pratley, MacDonald, Orlandi, Pintado.
Palamos CF: Toni Montero, Elies, Giro, Garagarza, Petalla, Carmelo, Vichu, Diego, Pinilla, Teixidor, Jaume Duran.
Swansea made a tentative start as Alan Tate had to scramble a clearance away after Dorus de Vries came under a strong challenge from Diego.
But the tourists regrouped and Leon Britton slipped a neat pass into Gorka Pintado who forced the first save of the game out of Toni Montero from the edge of the area with 11 minutes gone.
But Palamos were already proving stronger opposition than last night's test against Pelarada.
Swansea were slowly starting to get their passing game together, however, without troubling the Palamos 'keeper.
In fact, it was the home side who came the closest to opening the scoring when Jauma Duran fired a 20-yard shot inches the wrong side of the top corner.
Roberto made his first change in the 34th minute as striker Guillem Bauza replaced Pintado in a straight swap.
His side were forced to defend first though as Ashley Williams cleared a shot off the line from Pinilla.
Play immediately switched to the other end where Bussy planted a perfect cross onto the head of Andrea Orlandi only for the winger to glance his effort wide from a great position with 37 minutes gone.
Orlandi came even closer in the 40th minute when Owain Tudur Jones did well to rob Texidor on the edge of the area. His pass found Orlandi who cut inside before thundering a shot against the post.
It saw Swansea finish the half strong with the opportunities starting to open up.
Half-time: Palamos 0 Swans 0
Swansea changed their back four for the start of the second half with Fede Bessone, Matty Collins, Albert Serran and Dennis Lawrence coming on.
Leon Britton ook over the captain's armband with Garry Monk and Tate off the pitch.
Within a minute Serran headed an Orlandi free-kick just over before the Swans took the lead.
With 47 minutes on the clock, OTJ fed Andrea Orlandi on the left and the Spaniard took a touch before firing home a fantastic strike from a difficult angle for his firts goal of the pre-season.
Swansea, with OTJ having a great game in the middle of the park, were well in control now as Roberto made five changes with 64 minutes gone.
Tom Butler, Jordi Gomez, Joe Allen, Kristian O'Leary and Febian Brandy replaced Bussy, Orlandi, OTJ, Britton and Pratley.
Swansea lost a bit of momentum after that before MacDonald tried his luck from the edge of the area which the 'keeper saved with 10 minutes to go.
It was MacDonald's last bit of the action as he was replaced by Steffan Morrison five minutes from time.
As the game drifted to its conclusion, Orlandi's strike was enough to give Swansea their second consecutive tour victory.
