(Refiles with 'Olympics' in headline)
BERLIN, May 31 (Reuters) - SportAccord president Marius Vizer resigned on Sunday, conceding defeat in a row with the International Olympic Committee over control of international sports federations.
Vizer had challenged the IOC's grip on global sports, accusing it of being dated and blocking the creation of new events as well as lacking transparency.
His sharply-worded comments last month triggered a wave of departures from the umbrella organisation, representing some 100 international sports federations.
Many of the departing federations accused Vizer of a unilateral move and not speaking on behalf of SportAccord's members.