In the first round of this bantamweight fight, Song Yadong knocked out Alejandro Perez at UFC 239 in Las Vegas. Perez made a mistake by throwing a low left kick without putting his hands up because Song Yadong responded with a right cross to the face. One cannot go through the motions with Song Yadong the canvas will become an acquaintance.
The song that Song Yadong sang with this punch was a lullaby. Go to sleep, go to sleep!