Krejcikova

NEW YORK — Wimbledon champion Barbora Krejcikova was knocked out of the US Open in the second round on Wednesday, defeated by Elena-Gabriela Ruse 6-4, 7-5.

The No. 8-seeded Krejcikova won her second Grand Slam singles title this summer, but then she didn’t play any matches after the Paris Olympics. She acknowledged last week not knowing where her level of play was.

Turns out, it wasn’t good enough.

Ruse got much more work on the US Open’s hard courts while playing her way...