Marina Shafir knocked out by Amber Leibrock in 37 seconds at Invicta FC 13

Marina Shafir’s Invicta debut went very fast — and not in a good way.

Ronda Rousey’s best friend was finished by TKO in just 37 seconds by debuting Amber Leibrock at Invicta FC 13 on Thursday night in Las Vegas.

Leibrock (1-0) dropped Shafir (1-2) with a punch then landed ground and pound until Shafir was out cold. Shafir was going for a leglock, but Leibrock seemed to hold onto the cage to keep herself upright. Referee Steve Mazzagatti didn’t see it.

Shafir has now lost two in a row by first-round knockout after going undefeated as an amateur. Watch the knockout below.

WOW!!!! #InvictaFC13 opens up with a BANG! Leibrock w/ the finish! Start your FREE trial now http://t.co/r0HFwxDSTn http://t.co/7y0ZgScN8u

— UFC Fight Pass (@UFCFightPass) July 10, 2015

Marina Shafir’s Invicta debut went very fast — and not in a good way.

Ronda Rousey’s best friend was finished by TKO in just 37 seconds by debuting Amber Leibrock at Invicta FC 13 on Thursday night in Las Vegas.

Leibrock (1-0) dropped Shafir (1-2) with a punch then landed ground and pound until Shafir was out cold. Shafir was going for a leglock, but Leibrock seemed to hold onto the cage to keep herself upright. Referee Steve Mazzagatti didn’t see it.

Shafir has now lost two in a row by first-round knockout after going undefeated as an amateur. Watch the knockout below.