The Associated Press called the race for Cruz at 2:32 a.m. Eastern.
Cruz had to win more than 50% of the vote to put all 40 of Utah's delegates in his column — and the AP said he was on track to do so.
Less than an hour later, the AP confirmed Cruz would in fact pull off a 40-delegate sweep:
"Thank you Utah!" he tweeted.
The Texas senator had 69% of the vote to 17% for underdog John Kasich and just 14% for Trump with 85% reporting, per AP results.
The Beehive State alone wasn't going to tip the scales in Cruz's favor, but the convincing win served as proof that the brawl isn't over — and there will be fences to mend within the GOP when the nomination process finally concludes.
The Republicans engaged in some late-night Twitter brawling over a PAC-sponsored pro-Cruz ad featuring a provocative photo of Trump's wife in an attempt to sway voters in heavily Mormon Utah.
The Utah vote was also something of a test of Mitt Romney's influence in the state he now calls home.
Trump brushed off Romney's broadside, throwing his support for the 2012 GOP standard-bearer back in his face.
Utahns were determined to make their voices heard despite a series of obstacles: Republicans said they battled problems with the state's first test of a new online voting system.
10:04 a.m.: This article has been updated.