Celta Vigo moved into seventh place in the La Liga table as they downed Real Betis 3-2 at Balaidos on Monday in Week 21's final clash.
The visitors were often at fault for losing the ball in crucial areas and paid the price when Iago Aspas opened the scoring after 12 minutes, and Maxi Gomez doubled the hosts' lead 12 minutes into the second half.
A Sergio Leon strike against the run of play 19 minutes from time was a wake-up call for Celta, and Aspas re-established their lead eight minutes later with what transpired to be a crucial strike as Andres Guardado scored a penalty in the dying moments.