Five states, five big wins. In each of the contests Mr Trump finished above 50%. That's a key mark not just for the bounty of delegates it provides - particularly in Pennsylvania - but also because it indicates that no matter how closely John Kasich and Ted Cruz co-ordinate their campaigns, it may be hard for them to top the front-runner.
"Do you know what my ceiling is?" Mr Trump asked during his victory speech. "I think it's 100%."
The New Yorker couldn't resist taking a few shots at Ohio Governor John Kasich and "crooked" Hillary Clinton, of course, but for the second straight week he was relatively calm, focusing in particular on his economic message.
Mr Trump still has work to do before he clinches the nomination, and the Indiana contest next week looms large. If Ted Cruz can pull out a win there, then California becomes a decisive battleground.
No matter how the remaining weeks play out, however, Mr Trump will head into the Republican convention as the clear leader in both the popular vote and the delegate count - even if he doesn't reach the 1,237 number necessary to clinch the prize.
Unless the dynamics in this race shift considerably, it will be very difficult for Mr Cruz or any other Republican to make the case that Donald Trump shouldn't be the party's standard-bearer.
"I consider myself the presumptive nominee," Mr Trump said. "Senator Cruz and Governor Kasich really should get out of the race."
They're not going to follow his advice - but very soon, it may not matter.