Mezue ahịrịokwu na-esonụ: Mgbe Markešević dị afọ iri na ise, o ji oge 8:51.58, setịpụ ihe ndekọ mba n'ọsọ mita 3,000 maka ndị nọ n'afọ iri na ise. Markešević mere egwuregwu mba ụwa mbụ ya na 2003 European Youth Summer Olympic Festival na Paris, France, ebe ọ kwụsịrị nke abụọ n'egwuregwu 3000 mita. Na
2005 IAAF World Cross Country Championships, Markešević kwụsịrị na 36th ebe nke 125 finishers na ụmụ okorobịa ụmụ nwoke 8K agbụrụ. Na ngwụcha afọ ahụ, ọ bịara nke atọ n'asọmpi ụmụ nwoke na-eto eto na 2005 European Cross Country Championship. Na 2006 European Cross Country Championships, Markešević tinyere na nke abụọ n'ozuzu megide asọmpi U23 dị oke egwu, na-emecha n'ihu Daniele Meucci na Yevgeny Rybakov.