Shershun started to play football at academy of the hometown's Podillia[2] and later the Dnipro sports college.

At professional competitions Shershun debuted in 1997 for FC Dnipro[3] that was managed by Vyacheslav Hroznyi and later Mykola Fedorenko.

[1] In 2002 at age of 21[1] (more precisely 20, during the 2001–02 season's winter break)[4] he moved to play for PFC CSKA Moscow[3] that picked him up as a former member of Ukrainian squad on finals of the Euro 2000 (under-18) and the 2001 World Championship (under-20).

[1] Shershun retired from professional football in 2014[3] and enrolled into the FFU (UAF today) coaching courses.

[7] For couple of more seasons, 2015 to 2017, he played at regional level for Sluch Starokostiantyniv (Khmelnytskyi Oblast).