Bulgaria’s Bozhidar Sarâboyukov finished second with 8.34m in the final round. Switzerland’s Simon Ehammer took bronze with 8.07m.
Tentoglou, the Olympic and world champion, held his nerve after Sarâboyukov produced a last-round jump that came within a centimetre of gold at the Gyula Zsivótzky National Athletics Centre.
The result adds another major title for the Greek jumper at a meeting that has already produced world-leading sprint times and titles for Mondo Duplantis, Jakob Ingebrigtsen, Audrey Werro, Klaudia Kazimierska and Melissa Jefferson-Wooden.
Sarâboyukov forced the issue until the last jump of the competition. Ehammer’s 8.07m was enough for third on a high-quality podium.
The three-day World Athletics Ultimate Championship, offering a $10 million prize pool across 28 events, concludes in Budapest on Sunday.