Okun began playing tennis at age nine, and was selected to be part of the Israeli Tennis Federation program after a short course at school. In August and September 2009, he won three tournaments—an Israel F4, F5 and F6 tournament. In March 2015, he played in an Israel F3 tournament in Ramat HaSharon, Israel, and lost in the finals to
Isak Arvidsson of Sweden. ==ATP Challenger and ITF Futures finals==