Dee ihe na-aga n'ihu maka paragraf a - Antonov ruru eru maka ihe omume igwu mmiri abụọ na 2004 Summer Olympics na Athens, site na eclipsing FINA B-ọkọlọtọ ntinye oge nke 23.48 (50 m freestyle) na 51.65 (100 m freestyle) site na Missouri State Swimming Championships. Na 100 m freestyle
, Antonov gbara ndị ọzọ na-egwu mmiri asaa na okpomọkụ nke anọ, gụnyere ndị mmeri Olimpik ugboro abụọ George Gleason nke Virgin Islands na Allen Ong nke Malaysia. Ọ gbara gburugburu n'ọhịa ruo ebe ikpeazụ na nke iri ise na abụọ n'ozuzu site na 0.29 nke nke abụọ n'azụ Ong na 52.33. N'ihe omume nke abụọ ya, 50 m freestyle, Antonov kwekọrọ n'ọnọdụ ya site na nke mbụ ya n'ụtụtụ ụtụtụ. Na-egwu mmiri na okpomọkụ ise, ọ metụrụ Örn Arnarson nke Iceland aka iji were ebe nke isii site na 0.17 nke abụọ, na-apụ na oge ntinye ya nke 23.67.