Pedzisa mutsara unotevera: Antonov akakwanisa kupinda mumitambo miviri yekushambira kumaOlympics ezhizha ra2004 kuAthens, nekupfuura FINA B-standard yekupinda nguva ye23.48 (50 m freestyle) uye 51.65 (100 m freestyle) kubva kuMissouri State Swimming Championships. Mu
Mumakwikwi e100m freestyle, Antonov akakwikwidza nevamwe vanoshambira vanomwe mumakwikwi echina, kusanganisira vakwikwidzi veOlympic kaviri George Gleason wekuVirgin Islands naAllen Ong wekuMalaysia. Akapedzisa munda kunzvimbo yekupedzisira uye makumi mashanu nemaviri akazara ne0.29 yechipiri kumashure Ong mu52.33. Muchiitiko chake chechipiri, 50 m freestyle, Antonov akaenzana nenzvimbo yake kubva pakutanga kwake mangwanani e prelims. Achishambira mumakwikwi mashanu, akabata Örn Arnarson weIceland kuti atore nzvimbo yechitanhatu ne0.17 yechipiri, kunze kwenguva yake yekupinda ye23.67.