After becoming the Ukrainian Heavyweight Muay Thai Champion in 2007, he went on to win The Honor of Soldier tournament in Moscow, Russia later that year.
In the opening round, Lascenko beat Sultan Babaev by unanimous decision to qualify for the final eight on December 5.
On October 27, 2008, he defeated Stepan Kirlish to win the +91 kg gold medal at the 8th Ukrainian Muay Thai Cup.
He made it to the final but lost by knockout to Zabit Samedov, after he had beaten Noel Cadet by TKO and Dmitrij Bezus in the quarters and semis, respectively.
[3] He rebound from this loss by beating Dmitrij Bezus to take the +91 kg gold medal at the 8th Ukrainian Muay Thai Cup on September 21, 2009.
On April 3, 2010, Lascenko defeated Takumi Sato by unanimous decision (30-29, 30–29, 30–28) at the K-1 World Grand Prix 2010 in Yokohama.
[5] He would also go on to lose his next two fights after this, dropping decisions to Alexei Kudin on July 30 in Minsk, Belarus, and Ismael Londt on October 22 in Kazan, Russia.
[18] He rematched Freddy Kemayo in a tournament reserve bout at the SuperKombat World Grand Prix 2012 Final in Bucharest, Romania on December 22, 2012, and lost via split decision after three rounds.
[19] He rematched Dževad Poturak in the reserve bout for the K-1 World Grand Prix 2012 Final in Zagreb, Croatia on March 15, 2013, and lost via unanimous decision.
[24] Lascenko was pronounced dead on April 8, 2015, at the Odesa Jewish Hospital in Ukraine after being shot multiple times.
According to initial information, the cause of quarrel was a woman and generated a conflict between Odesa citizens and a group of eight Caucasians.