The global anti-doping regime is a hybrid regime operating as part of the global system of sports governance. This chapter analyses the accountability puzzle surrounding its specific hybrid constellation and the regime’s accountability response to a scandal from 2015, which exposed the Russian large-scale doping scheme. The analysis shows that, in the five years’ period following the scandal, the regime did not fully ignore calls to demonstrate accountability, yet its responses have been protracted and partial. Sanctioning or performance evaluation forums, which are said to be a defining feature of accountability relationships, have not been introduced, although the regime has adopted some structural changes that have dispelled prior conflicts of interests and system dysfunctions. Legitimacy pressures led to some functional improvements within the regime, although their power to enhance the accountability framework was limited. Our case indicates that a ’favourable’ political economy, where stakeholders have neither formal ’voice’ nor exit options, can afford leverage to a private regime owner to direct legitimacy pressures towards solutions that do not structurally diminish its power over the other actors in the regime.