NEW YORK (Reuters) - Spain's Carla Suarez Navarro celebrated her 30th birthday in style at the U.S. Open on Monday by beating Russian Maria Sharapova 6-4 6-3 to book her place in the quarter-finals.
Sharapova, the 2006 champion, had never lost a night session match in New York prior to her first Grand Slam meeting with Suarez Navarro.
"Thank you so much guys," Suarez Navarro said courtside after being wished happy birthday by the crowd. "It's the first time I've played this year at night. I'm very happy because I played a good match."
Five-times Grand Slam champion Sharapova paid the price for 38 unforced errors and won less than half of her first serve points while committing eight double faults.
With her most potent weapon not firing, she succumbed in one hour and 31 minutes under the floodlights at the Arthur Ashe Stadium, allowing 30th seed Suarez Navarro to record just her second career victory over the Russian in six attempts.
The Spaniard will meet last year's runner up Madison Keys in the quarters and knows she will be the underdog against the 14th seeded American.
"It will be a really tough match. She is from the United States so the crowd will probably help her," Suarez Navarro added.
"I need to be aggressive ... try to be solid, run and fight. This is the way that I can play really good tennis. I have the character inside, sometimes I have to show more but, well, I'm working on that."
(Reporting by Simon Jennings; Editing by Peter Rutherford)