He was born in Karagandinskaya. As a junior, he finished seventh at the 2004 Asian Junior Championships and twelfth at the 2005 Asian Championships, and won the gold medal at the 2005 Asian Indoor Games. In 2006 he finished fifth at the Asian Indoor Championships, but won the silver medal at the Asian Games. He furthermore won a silver at the 2007 Asian Indoor Games and the gold medal at the 2008 Asian Indoor Championships.
He has never reached a final at a major global competition. He competed at the 2007 World Championships, the 2008 World Indoor Championships, the 2008 Olympic Games, the 2009 Summer Universiade, the 2010 World Indoor Championships and the 2010 Asian Games without reaching the final.
His father and coach, also called Sergey Zasimovich, was a high jumper as well.
|2004||Asian Junior Championships||Ipoh, Malaysia||7th||2.04 m|
|2005||Asian Championships||Incheon, South Korea||12th||2.10 m|
|Asian Indoor Games||Bangkok, Thailand||1st||2.17 m|
|2006||Asian Indoor Championships||Pattaya, Thailand||5th||2.13 m|
|Asian Games||Doha, Qatar||2nd||2.23 m|
|2007||World Championships||Osaka, Japan||35th (q)||2.19 m|
|Asian Indoor Games||Macau||2nd||2.21 m|
|2008||Asian Indoor Championships||Doha, Qatar||1st||2.24 m|
|World Indoor Championships||Valencia, Spain||13th (q)||2.20 m|
|Olympic Games||Beijing, China||37th (q)||2.10 m|
|2009||Universiade||Belgrade, Serbia||13th (q)||2.15 m|
|Asian Championships||Guangzhou, China||9th||2.10 m|
|2010||Asian Indoor Championships||Tehran, Iran||6th||2.14 m|
|World Indoor Championships||Doha, Qatar||–||NM|
|Asian Games||Guangzhou, China||17th (q)||2.05 m|
|2011||Asian Championships||Kobe, Japan||11th||2.10 m|
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