Nyorai mberi kweiyi ndima - Akazvarwa mumusha weStambolovo kumaodzanyemba kwakadziva kumadokero kweBulgaria, Velichkov akatanga basa rake remitambo rinoshanda mugiredhi rechitanhatu, paakabatana nekirabhu yemuno yekumhanya-mhanya. Gare gare akachinja kuita biathlon. Velichkov akapinda mumitambo yake yekutanga yeOlympic muna 1980 uye akatanga pamutambo weWorld Championship mumutambo weWorld Championships muMinsk muna 1982. Akatorawo rutivi muMitambo yeOlympic muna 1984 na 1988 uye muWorld Championships muna 1983, 1985
, 1986, 1987, 1989 uye 1990 nokuda kweBulgaria. Kupedza kwake kwakanakisisa pamunhu mumwe nomumwe paOlympics kwakauya mumunhu mumwe nomumwe we20 km muna 1984, akapedza 13th. Nzvimbo yake yakanakisisa, uye bedzi, yokugumisa relay yakauya muna 1988, nzvimbo yechisere. Kupedza kwake kwakanakisisa pamunhu mumwe nomumwe paWorld Championships kwakauya muna 1982 muMinsk apo Velichkov akapedza 5th, chiitiko chaakatevedzera makore matatu gare gare muRuhpolding, zvose zviri mu sprint. Kuguma kwake kwakanakisisa kwechikwata paWorld Championships kwakanga kuri 10th iyo yakauya muna 1989 muFeistritz, uko kwake kwakanakisisa, uye chete, kupedzisa kwechikwata kwakasvikawo, nzvimbo yechi12.