By Simon Jennings

NEW YORK (Reuters) -Venus Williams showed flashes of vintage form under the lights at Arthur Ashe Stadium on Monday but despite pushing Karolina Muchova to a deciding set the 45-year-old American fell 6-3 2-6 6-1 in a thrilling U.S. Open first-round battle.

The seven-times Grand Slam champion was making a record-extending 25th main draw appearance in New York, where she won the title in 2000 and 2001, and delivered a spirited performance before a packed and partisan crowd.

“I was stressed,” Muchova said in her on-court interview. “You guys make me stressed, it was an unbelievable atmosphere. She’s such a legend so it’s nice to share the court with her. I’m so happy I was able to win today.

“I just tried to block the noise, and be focused on myself.”

Muchova took the

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