Charles Johnson (18-7 MMA, 7-5 UFC) had a rough first round against the unbeaten Lone'er Kavanagh (9-1 MMA, 2-1 UFC). But late in the second round, while he was backing up from a Johnson attack, Kavanagh dropped his hands and Johnson drilled him on the button to put his lights out for the first loss of his career.

Johnny Walker ended a skid of two straight knockout losses by scoring a shocking knockout of his own in a comeback win against Chinese light heavyweight Zhang Mingyang in the main event of UFC Fight Night in Shanghai.

In a 5-round light heavyweight bout in the main event, Johnny Walker and Zhang Mingyang meet Saturday at UFC Fight Night 257 in Shanghai, China.