At Newark's Prudential Center, Brady won a unanimous decision after outlanding Buckley 245-21 overall and 77-4 in significant strikes, while completing all four takedowns.
The result overturned heavy pre-fight market movement that had shifted Buckley from a +150 underdog to a -220 favourite, prompting bookmakers to flag abnormal betting and cut limits.
UFC president Dana White has previously pulled bouts over betting irregularities, and the promotion reportedly checked whether Brady was injured before the fight, but no such issue was borne out.
How can regulators distinguish market manipulation from a massive, yet legal, betting mistake?
Are unregulated prediction markets creating a new frontier for insider trading in sports?