Kammala wannan jumlar: Ser-Od ya fara shiga cikin abubuwan da suka faru a cikin 2002. Ya fara buga wasan sa na kasa da kasa a
2002 IAAF World Half Marathon Championships kuma ya tashi nesa zuwa marathon a gasar zakarun duniya ta 2003, inda ya zo na 63 tare da mafi kyawun sa'o'i na 2: 26:39. Ya kasance na goma sha biyu a Gasar Marathon ta Hong Kong ta 2004, na uku na Asiya da ya gama a fagen Afirka. Ya fara gasar Olympics a wannan shekarar a wasannin Olympics na Athens na 2004. Ya kasance ɗaya daga cikin 'yan Mongolia biyu da suka yi gasa a gasar wasannin motsa jiki, tare da mata marathon Luvsanlkhündegiin Otgonbayar. Ser-Od ya zo na 75 a cikin duka tare da lokaci na awa 2:33:24, kimanin minti ashirin a bayan mai nasara.