Carla Suarez Navarro has celebrated her 30th birthday in style by ending Maria Sharapova’s unbeaten record in night session matches at the US Open to book a quarter-final berth.

The Spanish 30th seeed took advantage of an error-prone Sharapova to secure a 6-4 6-3 victory in their first meeting at a grand slam.

“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.”

Sharapova, the 2006 champion, took a 23-0 night record at Flushing Meadows into the match but managed to win less than 50 per cent of points on her first serve and gifted Suarez Navarro 38 unforced errors.

With her most potent weapon not firing, Sharapova succumbed in one hour and 31 minutes at Arthur Ashe Stadium.

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,” Suarez Navarro said.

“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 I’m working on that.”

Keys cruised to a 6-1 6-3 victory over Slovakia’s Dominika Cibulkova earlier on Monday, relying on her serve and powerful groundstrokes to overpower the Slovakian.

With the US Open’s heat advisory put back into effect, the pair traded punishing groundstrokes under the blazing sun with Keys dominating the 76-minute match.

She is the highest-ranked player left in her side of the draw but has received very little attention so far with the likes of Serena Williams and defending champion Sloane Stephens dominating the headlines.

“It’s kind of nice to be under the radar,” the 23-year-old Keys said.

Japan’s Naomi Osaka reached her first grand slam quarter-final with a 6-3 2-6 6-4 victory over fellow 20-year-old Aryna Sabalenka.

Sabalenka saved three match points in the final game and had a point for 5-5 only to double fault on Osaka’s fourth chance.

“I’ve always dreamed of playing here and going to the quarter-finals and further. So I’m just glad I could do one of my goals,” the 20th-seeded Osaka said.

Osaka next plays unseeded Ukrainian Lesia Tsurenko, who struggled with the heat on the open grandstand court but battled past Czech teenager Marketa Vondrousova 6-7 (3-7) 7-5 6-2.

Tsurenko, who upset second seed Caroline Wozniacki in the second round, is through to her first quarter-final in her 29th grand slam.