15-year-old winger Lamine Yamal became Barcelona’s youngest ever player as the La Liga leaders moved 11 points clear.
Andreas Christensen, Robert Lewandowski and Raphinha all scored before a Guido Rodríguez own goal secured the win but it was the introduction of the academy product, who turns 16 in July, in the 84th minute to replace Gavi that caught the eye.
At 15 years and 290 days, Yamal created history by becoming Barcelona’s youngest and La Liga’s fifth-youngest player ever.
Mallorca’s Luka Romero is the youngest player to feature in La Liga when he came on against Real Madrid in 2020, aged 15 years and 219 days.
Nicknamed Fearless by Xavi, Yamal was included him in the first team squad for the first time against Atletico Madrid last Sunday.
41-year-old Betis winger Joaquin who also featured at the Nou Camp on Saturday, had already made 215 La Liga appearances when Yamal was born.
Betis substitute Edgar Gonzalez, who had been brought on for the injured Luiz Felipe, was sent off in the 33rd minute after collecting two yellow cards in quick succession.