Watch: Harris KOs Oleinik in 12 seconds
Josh Hedges/Zuffa LLC / UFC / Getty

Walt Harris has shaken up the UFC heavyweight rankings.

Ranked No. 14 in the division, Harris knocked out ninth-ranked Aleksei Oleinik with a combination in what was officially just a 12-second bout at UFC San Antonio on Saturday. It's the third-fastest knockout in UFC history.

For U.S. viewers:

For Canadian viewers:

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Watch: Harris KOs Oleinik in 12 seconds
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