[2] He is ranked as the third best light heavyweight in the world by Combat Press as of September 2022,[3] and third best by Beyond Kickboxing as of October 2022.

[5] He is a professional Kickboxer and previously fought out of Sparta Fight gym in Lithuania, Vilnius city.

"[8] Maslobojev made his professional debut against Steve Hooper in May 2007, when the two fought for the WKA Heavyweight Championship.

In his next fight, Maslobojev won the Baltic Muay Thai Light Heavyweight title, with a decision win over Kristaps Zile.

After defeating Ricardo van den Bos, he entered the 2011 KOK European Heavyweight Grand Prix.

Following a TKO victory against Noureddine Ajnaou at KOK`55 World Series,[20] Maslobojev signed with ONE Championship.

He made his organizational debut at |ONE Championship: Grit and Glory, in a rematch with Antonio Plazibat.

[21] In his second fight with ONE, he fought Florent Kaouachi at ONE Championship: Pursuit of Power, and won by unanimous decision.

[22] Moving away from ONE Championship, Maslobojev earned a unanimous decision against Rafael de Souza[23] and a stoppage win against Fraser Weightman.

[24] King later withdrew, and Maslobojev was rescheduled to fight Bahram Rajabzadeh at Glory 69: Düsseldorf.

[35] Maslobojev was scheduled to face Olivier Langlois-Ross at KoK Mega Battle on 20 November 2021.

[37] Maslobojev was booked to face Nika Kulumbegashvili at KOK 99 Mega Series on 19 March 2022.

[47] Maslobojev faced Bogdan Stoica in the quarterfinals of the Glory Light Heavyweight Grand Prix, held on June 8, 2024, in Rotterdam, Netherlands.