Startup Uber executive plays down deal prospects in Brazil, citing scale Updated : April 17, 2018 12:45 PM IST Macdonald also runs Uber's operations in the Asia Pacific region, where the company agreed to sell its Southeast Asian business to larger rival Grab last month. Brazil continues to be Uber's biggest market by rides after the United States, Macdonald said. Sao Paulo is Uber's No. 1 city globally, and Rio de Janeiro is also in the top five. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.