[1] Born in Ukraine, Kryvonos moved with his family from Donetsk to New York City at the age of 13.

[2] Kryvonos reached a career best singles world ranking of 389 and won four ITF Futures titles.

[3] While competing on the ATP Challenger Tour he had a win over top 100 player Frank Dancevic.

In doubles his best ranking was 508 and he played in the main draw of the 2005 US Open as a wildcard pairing with Denis Zivkovic, losing in the first round to José Acasuso and Sebastián Prieto.

He was found guilty of colluding with third parties "to contrive the outcome of a match" at a 2015 Challenger tournament.