Fans cheer Venus Williams during her first-round match against Karolina Muchova at the U.S. Open tennis championships in New York. AP

NEW YORK — Even at age 45, even after two years away from Grand Slam tennis, Venus Williams displayed some big serves and powerful groundstrokes at the U.S. Open on Monday night in front of a supportive crowd at Arthur Ashe Stadium, before losing 6-3, 2-6, 6-1 to Karolina Muchova.

Williams was the oldest singles player at the hard-court tournament since Renee Richards was 47 in 1981.

“She's such a legend of our sport,” 2023 French Open runner-up Muchova said about seven-time Grand Slam singles champion Williams, adding that it was an honor “to share a court with her.”

In just the fourth match of a comeback that began last month after more than a year of

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