well,if is a single game,then for example : X reports a win vs Y,but he may also won other tus single wich he did not reported yet,against Z...than X needs to change his opponents name ^^
and in clanners,XXX clan plays vs. YYY clan...XXX wins both picks,but maybe he had diffrente partner/opponents in the 1st game than the 2nd one ^^
P.S.: lol at my examples xDDD