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UFC on ABC 9: Whittaker vs. de Ridder was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on July 26, 2025, at the Etihad Arena in Abu Dhabi, United Arab Emirates. A middleweight bout between former UFC Middleweight Champion (also The Ultimate Fighter: The Smashes welterweight winner) Robert Whittaker and former ONE Middleweight and Light Heavyweight World Champion Reinier de Ridder headlined the event.