Betis looked the stronger early on and found joy down the left-hand side. However, both sides struggled to create a clear opening.
Early in the second half, Betis defender Nono tried his luck with a speculative shot from 40 yards.
Jean-Pierre Barrientos was next to attempt a long-range shot as chances remained at a premium. However, like the others, his sailed well wide.
Jorge Molina had a good chance to put Betis in the lead, but after breaking clear of the defence, he was unable to beat the goalkeeper.
Barrientos then curled a ball in which evaded everyone on the edge of the six-yard box.
With time running out, Chuli found the net from 12 yards to give Betis the win.