The No.8 seed won her second grand slam singles title this summer, but she didn't play any matches after the Paris Olympics.Â
She acknowledged last week not knowing where her level of play was. Turns out, it wasn't good enough.
"Winning Wimbledon is amazing. It's a great, great, great result, I'm very proud about it and how I was able to handle everything there," said Krejcikova, who hadn't played a tournament on hard courts since February.
"I was playing quite well, definitely better than in the first match. I think my game was improving, but it just wasn't enough."
Ruse got much more work on the US Open's hard courts while playing her way into the main draw through the qualifying tournament and was better than Krejcikova on the points that mattered most.
Elena-Gabriela Ruse, of Romania, reacts after defeating Barbora Krejcikova. (AP PHOTO)
She fought back from 5-3 down in the second set to win the final four games.
"Barbora, she's such a good player, she's won so many matches in the last two years and it's just a dream for me," said Ruse, a 26-year-old from Romania.
She advanced to the third round of a slam for the first time and will play No. 26 seed Paula Badosa, who eliminated American Taylor Townsend 6-3 7-5.
Badosa continued her strong summer by reaching the third round of the for the first time.
Jule Niemeier of Germany defeated Japanese Moyuka Uchijima 6-4 6-0 to reach the third round.
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