Serena and Venus Williams knocked out of US Open

Serena Williams' illustrious doubles career has likely come to an end

she and her sister Venus fell in straight sets in Doubles Match

They lost to the Czech duo of Linda Nosková and Lucie Hradecká

The Czech Republic duo of advanced to the second round, winning 7-6(5), 6-4.

Linda Noskova is just 17 years of age

"I think we did a very good job, and I'm so sorry for you that we beat them, but we are so happy we did it," Hradecká said to the 23,000-plus fans in an on-court interview moments after the match.

It was the first time she had teamed with Nosková in doubles.

The Williams duo started well and had some chances too