All the predictions about this NBA draft were right about the top two picks and right about how unpredictable everything else would be.

Ben Simmons, a 6-foot-10 LSU point forward from Australia, went No. 1 to the 76ers and was followed by former Duke wing Brandon Ingram to the Lakers, as everyone expected. Then all mayhem broke out Thursday night at Barclays Center, from major trades to surprising, out-of-left-field picks.

Oklahoma City made the big move of the evening, trading forward Serge Ibaka to the Magic for guard Victor Oladipo, forward Ersan Ilyasova and the rights to Gonzaga star Domantas Sabonis — the son of former Trail Blazers center Arvydas Sabonis — who was taken 11th overall. The deal gives the Thunder more cap room with Kevin Durant a free agent this year and Russell Westbrook a free agent next year.

By the time the trade was made, the night already was off to a wild start. After the two predictable choices were made, the Celtics kept the third pick despite myriad trade options and made the surprising pick of Cal freshman forward Jaylen Brown. Croatian forward Dragan Bender, who some have compared to the Knicks’ Kristaps Porzingis, went to the Suns at No. 4. The Timberwolves selected Providence point guard Kris Dunn, who should fit in well in their young, athletic lineup that also features Karl-Anthony Towns and Andrew Wiggins, though there were rumors of a potential trade to the Bulls centered around All-Star guard Jimmy Butler.

“Athletes like to play up and down, and that’s how my game is,” Dunn said. “I like to play at a fast pace, that up-tempo [style]. We’re all young so it’s going to make the relationship even stronger because we’re all trying to learn together, we’re all trying to build together, and we’re going to try to compete every game.”

Buddy Hield, the national player of the year, went to the Pelicans at No. 6, and the Nuggets chose Kentucky combo guard Jamal Murray seventh, which gives them the potential for a young, dynamic backcourt with Murray and point guard Emmanuel Mudiay. The Kings picked Washington forward Marquese Chriss eighth and traded him to the Suns for the 13th and 28th picks, and the rights to guard Bogdan Bogdanovic.

After the Raptors chose Utah 7-footer Jakob Poeltl ninth, the Bucks made the biggest surprise of the wild night, choosing Thon Maker, a 7-1 forward with perimeter skills who didn’t play college basketball. Maker, from the South Sudan, was allowed entry into the draft because his camp presented documentation he graduated high school last spring. Still, Maker was projected late in the first round, and there were reports earlier in the day alleging he was at least 21 years old, instead of his listed age of 19. He wasn’t even in the green room, watching from the stands instead.

“I was 5 years [old] when I decided I first wanted to be a pro and take basketball serious,” Maker said, smiling from ear to ear. “So it’s been a long time because I’ve put in a lot of games, a lot of work, and to finally see it pay off, really I’m at a loss for words. When I was walking [up to the podium], I was trying to say ‘Thank you’ to my family, [but] I was at a loss of words, and I speak with them every day.”

The night only got wackier. At No. 12, the Suns picked Greek big man Georgios Papagiannis, a projected second-round pick who was recruited by St. John’s last spring but opted to stay overseas. The Celtics chose French forward Guerschon Yabusele at No. 16, another international prospect who wasn’t supposed to be off the board so early, and went for another potential draft-and-stash prospect in Croatian center Ante Zizic at No. 23.

“Nobody was expecting [that],” Yabusele said. “I was really surprised to be [picked] there, but I was so happy.”