Serena, Venus Williams knocked out of US Open doubles by Czech duo

Serena and Venus Williams lost to Lucie Hradecka and Linda Noskova 7-6 (5), 6-4 in the opening round of the US Open doubles on Thursday night

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It was Williams first match together in more than four years and 25 years after they made their tournament debut

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With a 5-4 lead in the opening set and two set points, the Williams duo got off to a strong start. However, the Czechs rallied back

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After the game, Hradecká addressed the crowd, saying, "I think we did a nice job, and I'm very sorry for you that we beat them, but we are so glad we did it."

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It was the first time Hradecká had teamed with Nosková in doubles

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“I was speechless when I found out I'm going to face these two. I mean, they're legends.” said Noskova, a 17-year-old making her Grand Slam debut in doubles

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Serena and Venus' match on Thursday night might have been their last as doubles team

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