O’Malley, however, also rocked the Russian with several shots, and opened a nasty gash near Yan’s right eye with a particularly vicious knee strike.
The eye-catching O’Malley – who has suffered just one defeat in 18 professional outings – could now be poised for a shot at current 135lbs ruler Aljamain Sterling.
Sterling defended his title with a one-sided TKO victory over two-time former champion TJ Dillashaw in their co-main event in Abu Dhabi.
Yan, 29, will have to rebuild after losing a second successive contest, having been on the wrong side of another contentious judging decision in his title rematch with Sterling at UFC 273 in April.
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