This was Chelsea's first real test in the Conference League all season. They had blown away limited opposition in nearly every other game - scoring 41 goals in their first 14 fixtures - and have been odds-on favourites to win the trophy for months.
Unlike the previous winners of Europe's third-tier tournament - Roma, West Ham and Olympiakos - the final was not one of the biggest games the Blues have played in. But it results in Chelsea's first trophy of any type since the Club World Cup in February 2022.
And it marks a successful first season for Maresca at Chelsea, having sealed a Champions League place on the Premier League's final day by beating Nottingham Forest.
Real Betis, who finished sixth in La Liga, are a cut above the other teams Chelsea have faced this season - and Maresca knew it, as he kept six of the team who beat Forest in the starting XI. In many European games this season, he had changed the entire team.
They were miles off it in the first half - and Betis could have led by two or three goals at the break.
But after that point, with Reece James replacing Malo Gusto as an inverted right-back, things got better.
And once Palmer cut in from the right before crossing for Fernandez to nod home, Chelsea never looked back.
England's Palmer, who was not even registered for the league phase, picked out Jackson to put them ahead. And then Manchester United loanee Sancho curled home and Caicedo added a late fourth.
It was apt that Dewsbury-Hall, who has played all 15 Conference League games this season, got on the pitch to assist Sancho's goal.
Chelsea's season is not finished though, as they start their Fifa Club World Cup campaign in mid-June in the United States.