In Yu-Gi-Oh! East AcademyDavid utterly destroys Denero in his first duel. Proving himself to be more than just some fanboy.
And before that was Marcus's duel against Denero's father. Every move the latter made only served to help Marcus's strategy. Which cultimated in him finishing off the culitst with a casual One-Hit Kill.
Amanda vs. Sam Sinister and the Brickster in the subway station, and Frozeen and Libo vs. Lord Vladek in the subway tunnel. The villains never stood a chance.
Rex vs. French Fries and Pharisee vs. French Fries. In both instances, French Fries was soundly curb-stomped.
Pharisee vs. Trigger was actually a subversion. For most of the fight, it was definitely a Curb-Stomp Battle, as Pharisee easily overpowered Trigger in the fight. However, it was ultimately subverted because Trigger knocked out Pharisee in the end, emerging as the victor of that fight.
Wikizilla Roleplay: The king of the Shadowclaw, Slayer, has amassed enough power through 600 years that him blinking at his full power can destroy everything in a 500 LIGHTYEAR RADIUS. You can only imagine how many battles he wins with this trope.
One example is the battle with Barugon. Slayer kills him without even releasing any of his limits.
Barugon survived and made a Heel–Face Turn, but only after becoming a cyborg to keep him alive.
Another example is Nexus, a character who was close to a Big Bad. Slayer decides to remove all his limits, to the point here his blinking can destroy galaxies. He vaporizes and obliterates Nexus without taking any damage at all.
Lords Among The Ashes: Has several with the most prominent one taking place on turn one. Most armies, even those from Remnant, would suffer severe casualties or even complete annihilation if they tried to invade a Grimm-infested ancient city on the Dark Continent. Most armies aren't led by Jaune Arc. The city is taken and all of its former inhabitants were purged in under two years with only six lives lost.