This chapter aims to show that the work of the Court of Arbitration for Sport (CAS), which is often identified as the institutional centre of the lex sportiva, can be understood as that of a seamstress weaving a plurality of legal inputs into authoritative awards. In other words, the CAS panels are assembling legal material to produce (almost) final decisions that, alongside the administrative practices of sports’ governing bodies, govern international sports. It is argued that, instead of purity and autonomy, the CAS’s judicial practice is best characterised by assemblage and hybridity. This argument is supported by an empirical study of the use of different legal materials, in particular pertaining to Swiss law, EU law and the European Convention on Human Rights, within the case law of the CAS. The chapter is a first attempt at looking at the hermeneutic practice of the CAS from the perspective of a transnational legal pluralism that goes beyond the identification of a plurality of autonomous orders to turn its sights towards the enmeshment and entanglement characterizing contemporary legal practice.