UFC: featherweight champion Conor McGregor endured a stun rout as Nate Diaz won their welterweight battle in Las Vegas.

American Diaz, 30, constrained the Irishman to submit in the second round - his first thrashing following 2010.

McGregor, 27, said: "I'll face it like a man, similar to a champion. I'll return and do it once more."

In another astonishment, ladies' bantamweight champion Holly Holm lost in the fifth round to Miesha Tate.