What happened: Sean Strickland defeated Khamzat Chimaev by split decision in the UFC 328 main event on Saturday, May 9, to become UFC middleweight champion again. The judges scored it 48-47, 47-48 and 48-47 at Prudential Center in Newark, New Jersey. The loss was the first of Chimaev's MMA career.

Why it matters: The result resets the middleweight division and adds another major title-fight upset to Sean Strickland's resume. ESPN Stats & Info said Strickland is the only fighter since 2008 with multiple title-fight wins as a 3-1 underdog or longer, a note that could shape rematch pricing and future middleweight markets.

What to watch: Watch for UFC confirmation on whether Chimaev gets an immediate rematch or if the promotion moves Strickland into a new title defense. The and contender queue at middleweight should react quickly after the upset.