BattleBots/Awesome

Many examples.
 * Diesector versus Final Destiny in Season 5. Final Destiny was a rookie robot that was, in the builder's words, "designed to defeat Diesector and Toro", who were the two bots to watch in the Superheavyweight division. Diesector's standard weapons (a pair of clamping jaws and two hammers) didn't look like they'd be effective against FD's design (very low, giant spinning bar, similar to Hazard). Then when the fight starts we see that
 * Made especially awesome by the pre-fight interviews. Diesector's driver, Donald Hutson, says that he will "remove off [Final Destiny's] clovers, one leaf at a time." At the time, it seems like some obscure, luck-related metaphor, but once the fight begins, he proceeds to do exactly that.
 * Also, Evil Cheese Wedge vs. The Butcher.
 * Son of Whyachi vs. Nightmare is one of the quintessential examples.
 * Hazard vs. T-Minus
 * BioHazard vs. Son of Whyachi
 * Ziggo vs. Scrap Daddy. You can go ahead and guess which robot lives up to its name by the end of this match.
 * Blendo. Just ... Blendo.
 * Diesector vs Vladiator