BRUSSELS, Belgium (AFP) — Armand 'Mondo' Duplantis vowed that any danger of becoming complacent would be shelved after he suffered a rare defeat at the Diamond League meet in Brussels on 2 September.

Duplantis failed three times at 5.91 meters, falling to the mat on the third botched effort with a gaping mouth in stunned disbelief.

Ernest John Obiena of the Philippines successfully passed at the same height on the third time of asking, which left him also shaking his head in disbelief, so dominant has Duplantis been in his event.

It was the first defeat of a sparkling season that has seen Duplantis, a 22-year-old US-born Swede, win 17 competitions, 14 achieved with vaults over the six-meter barrier.

Those victories have seen him seal world indoor gold in Belgrade in March and world outdoor honors in Oregon in July. Both were achieved with world record vaults, of 6.20 and 6.21 meters respectively.

"I did a lot of things poorly technically," said Duplantis, a meticulous perfectionist in a notoriously technically-testing discipline that needs mastery of the runway approach, proper handling of the pole and complete confidence in the exacting projection upwards and over the bar.

"It's rare for me to jump the way I did. Maybe I needed a bit of a wake-up call. I've got to come back next year and do something more special for the people that came out."

Duplantis maintained that he felt he could have jumped higher.

"But I didn't jump as I would have liked, for sure. I am human and I make mistakes and I definitely made some today.

"I didn't find the good rhythm on the runway today. I was just thinking about the wrong things. It happens sometimes.

"It's not that easy. You need to be in the exact angle and you need the speed to take off and I didn't find that today."

Duplantis said he would aim to improve by the time of next week's Diamond League finals in Zurich.