For 2015, Baptista moved to Europe to compete in the Euroformula Open Championship, racing for reigning champions RP Motorsport. He secured the championship title at the final round of the season in Barcelona, finishing five points ahead of Russian Konstantin Tereshchenko after taking race victories at Paul Ricard, Estoril, Red Bull Ring, Spa-Francorchamps and Monza. He also finished second to Tereshchenko in the accompanying Spanish Formula Three Championship, which was held within the main championship at the Jerez, Estoril and Barcelona rounds.