Britain's Cameron Norrie has been beaten by teenage American qualifier Learner Tien successful the opening circular of the Mexican Open successful Acapulco.
Norrie, who is present 74th successful the world, was beaten 7-6 (7-5) 6-3 by the 19-year-old, who is ranked 9 places beneath him.
The Briton had won the lone erstwhile gathering betwixt the pair, successful Hong Kong earlier this year.
Tien led 4-1 successful the opener earlier Norrie recovered and served for the acceptable astatine 5-4. But helium was breached and Tien went connected to instrumentality the consequent tie-break and power the lucifer aft that.
Second effect Casper Ruud precocious to circular 2 by beating France's Arthur Rinderknech 6-4 6-3 portion American brace Tommy Paul and Ben Shelton, the 3rd and 5th seeds respectively, besides went through.