Zarazua stuns Keys, Krejcikova eases past Mboko in US Open first round

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NEW YORK - Mexicos Renata Zarazua pulled off a stunning upset by beating sixth seed Madison Keys while twice major winner Barbora Krejcikova knocked out promising Canadian teenager Victoria Mboko, as the U.S. Open first round continued on Monday.

Keys finally claimed her maiden major at the Australian Open this year but produced an astonishing 89 unforced errors in the opening match of the day on Arthur Ashe Stadium as she fell to a 6-7(10) 7-6(3) 7-5 defeat.

Zarazua, the only Mexican player in the U.S. Open main draw, saved seven break points across the match on Arthur Ashe Stadium for her first win over a top-10 player in a gruelling, three-hour and 10-minute affair.

Coming into the match I was like almost crying because I was really nervous but I think the crowd made it so chill for me, she said. I could hear some Mexican (fans) cheering so that was very nice.

She will hope to recreate the magic in the second round, where she faces Frenchwoman Diane Parry, who had no problems eliminating the twice Wimbledon winner Petra Kvitova 6-1 6-0 in her final professional match.

The Czech Krejcikova opened the action on Louis Armstrong Stadium in fine form after missing several months this year due to injury and easily navigated around Mboko 6-3 6-2, weeks after the 18-year-olds career breakthrough in Montreal.

She next plays Japans Moyuka Uchijima.

Cameron Norrie advanced after American Sebastian Korda retired when trailing 7-5 6-4 and the Briton will next play the winner of a match between 28th seed Alex Michelsen and Argentinian Francisco Comesana.

U.S. tennis royalty opens up the evening programme at Arthur Ashe Stadium, as