Michael Chiesa (14-3) hadn't lost since 2014, but that all changed in a controversial ref stoppage Sunday night at UFC Fight Night 112 at the hands of Kevin Lee (16-2).
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In the main event of the card, Lee locked in a rear-naked choke as the seconds were dwindling in the first round and appeared to have Chiesa in a bad position. Chiesa stopped trying to fight off Lee and looked to be going out as referee Mario Yamasaki called for the bell.
https://twitter.com/UFCONFOX/status/879184319067160578
Chiesa immediately got up and disputed the call, but the match was over.
He tore into Yamasaki in his post-match interview:
https://twitter.com/UFCONFOX/status/879199010984140801
Yamasaki is facing plenty of backlash for not waiting for a tap or for Chiesa to go out.
Chiesa will appeal the decision and called for a rematch with Lee as soon as he can get one.