One year ago, Bo Nickal left Madison Square Garden an unbeaten prospect fresh off his seventh victory as a professional fighter.

The former amateur wrestling stud is back in New York for UFC 322 on Saturday and a bout against legendary world champion jiu-jitsu practitioner Rodolfo Vieira, this time absent the sheen that comes with a perfect MMA record.

If it still smarts that his zero had to go — with Nickal (7-1, six finishes) falling via TKO to Reinier de Ridder in May — he’s doing a good job of masking it.

“For me, setbacks are a part of life, and I think for anybody. It’s nothing new to me,” Nickal, who in 2016 suffered the only NCAA wrestling tournament loss of his career at the Garden, told The Post on Wednesday at media day in midtown Manhattan. “I’ve lost in the national finals,

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