He is best known for his time in WWE, in their developmental territory NXT as King Konstantine.
Petković won two bronze medals in Greco-Roman and Freestyle wrestling at the 2009 Mediterranean Games in Pescara, Italy.
[2] On April 13, 2015, it was announced that Petković had signed a developmental contract with WWE and begun training to become a professional wrestler at the WWE Performance Center in Orlando, Florida.
[3] On December 3, 2015, he had his first professional wrestling match in a NXT House Show as King Konstantine.
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