The CAS Panels’ power of review of a decision appealed against is a well-known feature and fundamental principle of the appeals against decisions issued by the jurisdictional instances of federations and sports-governing bodies to the Court of Arbitration for Sport (CAS). Notwithstanding the Panel’s full power of review, a newly inserted paragraph in Article R57 gives the possibility to the Panel to refuse evidence submitted by the parties “if it was available to them or could reasonably have been discovered by them before the challenged decision was rendered”.