Makes his Open debut nine years after he lifted the British Boys title at Kilmarnock Barassie, thus emulating his mentor Jose Maria Olazabal.
Two years before that he was part of the Europe side at the Junior Ryder Cup in Kentucky and just before his 18th birthday he represented Spain in the Eisenhower Trophy World Team Championship.
Turned professional the following season and with three runner-up finishes on the Challenge Tour in 2013 earned promotion to the main circuit.
Twice failed to keep his card, but was joint winner of the 2015 qualifying school and in 2017 won his first crown at the Saltire Energy Paul Lawrie Match Play event in Germany.
Home player Marcel Siem led the final by three at the turn, but Otaegui took six of the next eight holes.
His second win came last season at the Belgian Knock-out, which after 36 holes of stroke play became another match play event.
It followed a runner-up finish at the Volvo China Open on his previous start and a tie for third at November’s Turkish Airlines Open led to him finishing in Europe’s top 30 for the season and so clinched his place at Royal Portrush.