Carlos Sayao



+1 416 294 7800


Bar Admissions:
Ontario, 2015


  • Arbitration & Mediation
  • Class Actions
  • Commercial Litigation
  • Sports Litigation

Carlos is a practical and results-oriented litigator who advocates on behalf of a diverse range of clients.

With his calm demeanour, he effectively navigates high-pressure situations with unflappable composure. Before joining Tyr, Carlos was an associate at Davies Ward Phillips & Vineberg LLP, where he developed a broad commercial and class actions litigation practice.

As a former competitive swimmer who represented Canada at the World Championships and Commonwealth Games, Carlos brings to bear his passion for sport in representing athletes and sport organisations in complex disputes. He has appeared before the Court of Arbitration for Sport on multiple occasions, including representing South African Olympic champion Caster Semenya in a landmark case challenging a regulation that requires certain women to lower their naturally occurring testosterone levels as a condition of participation in women's sport.

Vale Canada Limited

Acted for Vale Canada Limited and its affiliates in defending contractual claims before the Supreme Court of Newfoundland and Labrador involving mining royalties pertaining to the Voisey's Bay Nickel Project.

Detour Gold Corporation

Acted for Detour Gold Corporation in a securities class action involving alleged misrepresentations in relation to the ramp-up of the Detour Lake Mine.

Rogers Communications Inc.

Acted for Rogers Communications Inc. in connection with numerous multi-billion dollar class action proceedings across Canada to recover "system access fees" charged to consumers by wireless service providers in Canada in the period since 1987.

World Anti-Doping Agency

Acting for the World Anti-Doping Agency in defence of a civil action filed in the Ontario Superior Court of Justice by three Russian cyclists who were denied entry to the 2016 Olympic Games in Rio de Janeiro.

Caster Semenya

Representing South African Olympic Champion Caster Semenya in international proceedings seeking to invalidate a regulation that requires certain women to lower their naturally occurring testosterone levels as a condition of participation in women's track and field.

Dutee Chand

Successfully represented Dutee Chand, an Indian-born sprinter, in a landmark international sports ruling suspending the operation of the International Association Athletic Federation's Hyperandrogenism Regulation, which screens female athletes on the basis of their natural testosterone levels.

International Paralympic Committee (IPC)

Successfully represented the International Paralympic Committee (IPC) before the Court of Arbitration for Sport in upholding the decision of the IPC to exclude the Russian Paralympic Committee from the 2016 Paralympic Games in Rio.

Chris Moiser

Represented Chris Moiser, a transgender athlete, in challenging an international regulation that impacted his ability to compete in the male category.


  • Benchmark Canada – Future Star
  • Benchmark Canada Impact Case of the Year Award (2019) — Recipient


Swim Ontario
Young Canadian Arbitration Practitioners (YCAP)


McGill University, BCL/LLB, 2014
University of Oxford, MSc (Environmental Management) (with Distinction), 2007
University of Michigan, BSc (Civil & Environmental Engineering) (Summa Cum Laude), 2006