Karetsas makes Champions League history for Dortmund

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Aitor Ruibal cancelled out Fabio Silva's goal in the second half, but Karetsas, who is the youngest Dortmund player to score a winner in the competition, settled the contest.

Serhou Guirassy missed a sitter just three minutes in, and Betis had a 14th-minute goal ruled out; Antony coolly slotted in after a pacy counter-attack, but Troy Parrott had been caught offside in the build-up.

Daniel Svensson and Nelson Deossa had attempts saved at either end as both sides continued to press, while Gregor Kobel was also alert to keep out Abde Ezzalzouli.

While neither side could find a first-half breakthrough, Silva got the opener just four minutes into the second, slotting in after Alvaro Valles had kept out Jobe Bellingham's drilled effort.

Valles kept out Karetsas shortly after, and Betis soon regained their rhythm, and Kobel had to rush out to smother Angel Ortiz's close-range attempt.

But Betis got the equaliser less than a minute later as Ruibal latched onto Ezzalzouli's fizzing cross to fire past Kobel from the angle in the 67th minute.

Dortmund refused to sit back, though, with Valles needed to keep out Bellingham, but he will feel he could have done better with Karetsas' 72nd-minute strike.

The youngster put his laces through the shot on the edge of the box, and Valles got a hand to the effort but could not stop it from hitting the back of the net.