Last-second knockout by Leon Edwards earns

earns him the welterweight championship

The MMA community was stunned by Leon Edwards

In the main event of UFC 278 on Saturday night at Vivint Arena

Edwards knocked out Usman with a head kick in the final round

of a contest he was comfortably losing. At 4:04 in the fifth round

the contest was over. Usman was regarded as the world's top boxer pound for pound

Usman's record-breaking 15-fight winning streak in the UFC was ended by Edwards

One of the most astounding knockouts in sports history took place