#4 Vladimir Kozlov (SmackDown February 2009)
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Probably the most shocking defeat for the Undertaker came by Vladimir Kozlov.
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Believed to be the next big thing, WWE put Kozlov over the Undertaker by reversing an Old School into a Powerslam and picking up a surprising win.
WWE tried its hardest to push the Moscow Mauler by him defeating the Undertaker cleanly. His push was discarded as Kozlov was a disastrous in-ring worker. Just imagine the wrestler who became a laughing stock later, is one the few fortunate ones who beat the Deadman.
Kozlov was released in 2011 after failing to put on any significant feud. He could only manage a WWE Tag Team Championship title reign once.
Edited by Alan John