 Nyora kuenderera mberi kweiyi ndima - Petrov akave zera-anokodzera kuISU Junior Grand Prix JGP nhevedzano mumwaka wa2012-13 uye akapihwa zviitiko zviviri zveJGP mumwaka wake wekutanga. Akapedza ari wechishanu muJGP yake yekutanga muCourchevel, France, uye akahwina menduru yesirivheri pachiitiko chake chechipiri cheJGP muTurkey. A triple Axel akabatanidzwa muzvirongwa zvake zvenguva yake yokutanga pa ISU Junior Grand Prix circuit. Uku kusvetuka kwakamhara uye kwakasimbiswa mumutambo wake wechipiri weJGP, kunyangwe aine Negative Grade of Execution GOE. Sezvo 2012-13 mwaka mberi, Petrov akapfuurira kunyika akawanda yakachena 3A pamwe yakanaka GOE, kusanganisira mumwe panguva 4th Danho Cup of Russia akatevedzana muna November 2012. Mavhiki gare gare, pachikamu chechishanu cheCup of Russia series, Petrov akawana huwandu hwakabatanidzwa hwevatatu vakachena 3A kusanganisira 3A-3T mune yakasununguka skate. Akakunda makwikwi iwayo nomucherechedzo we221.15. Munyika dzakawanda, Petrov akahwina menduru dzegoridhe mumitambo yejunior pa2012 Coupe de Nice uye 2013 20th Volvo Open Cup. Kumakwikwi eRussia, akahwina menduru yegoridhe mumutambo wejunior uye akahwina menduru yegoridhe mumutambo wejunior. Mumakwikwi ake ekupedzisira emwaka, Petrov akahwina menduru yegoridhe yejunior pa2013 Triglav Trophy aine huwandu hwakazara hwe192.97 mapoinzi, ayo aisanganisira 3A 1.00 GOE mupfupi uye 3A 2.00 GOE uye 3A-2T 1.00 GOE mune yemahara skate. 