Hebert took the lead with a birdie on the second hole, but Otaegui drew level on the fourth before three birdies in a row from holes 6 to 8 sealed the tournament win for the 25-year-old.

Otaegui's previous tour victory was the Saltire Energy Paul Lawrie Match Play in August last year, and he has now had six top-20 finishes in a row in this season's Race to Dubai.

“I'm just very proud about my week,” Otaegui said. “Obviously your opponent is just next to you, but I just tried to focus on my game.”

Scotland's David Drysdale (-1) claimed third place in Antwerp after he beat James Heath (par) from England in a playoff.

Dimi Papadatos was the best of the Australians, finishing T17 after being defeated by Drysdale in the second round of the knockout stage.

The Belgian Knockout is an attempt by the European Tour to try new formats, featuring 36 holes of regular stroke-play, with the leading 64 players going head-to-head in nine-hole match-play clashes.