Tuliskeun saterusna pikeun paragraf ieu - Dina ICF Canoe Sprint World Championships, Opalev geus meunang 20 medali antara 1997 jeung 2007. Ieu kaasup sabelas emas (C-1 200 m: 1999, 2002, 2003; C-1 500 m: 1998, 1999, 2001
, 2002, 2006; C-1 1000 m: 1999, C-4 200 m: 2002, 2005), genep perak (C-1 200 m: 2001, 2005, 2007; C-1 500 m: 2003, C-1 1000 m: 2002, C-4 1000 m: 1997), jeung tilu perunggu (C-1 500 m: 2005, C-1 1000 m: 2003, C-4 200 m: 2001). Opalev ogé meunang dua deui medali di 2003 kajawaraan dunya di Gainesville, Georgia, Amérika Sarikat jeung emas di C-4 200 m jeung C-4 500 m acara, tapi ieu stripped tina medali maranéhanana lamun teammate Sergey Ulegin gagal hiji test doping.