Both Serena and Venus Williams are to miss out on representing the US against France in the Fed Cup at the end of this month, USA today reports.

The grand-slam winning sisters will, however, not be a part of the team for very different reasons.

Venus is not taking part in the competition because of an 'innocent mistake' as U.S. captain Mary Joe Fernandez called it.

Currently ranked 32nd, Venus apparently signed up for the hard-court tournament which is being played at Kuala Lumpur without realising the dates clashed with those of the Fed Cup.

Her younger sister and doubles partner Serena, on the other hand, has said that she is too worn out to take part in the event.

Speaking on Serena's reasons for not participating, Fernandez said: "She is mentally and physically exhausted and needs a break, so bad timing for us, unfortunately.

"But that happens sometimes. She's been going hard the past couple of years and needs to get refreshed."

Fernandez's roster - which was announced on Wednesday - instead includes current No. 18 Sloane Stephens, 42nd-ranked Madison Keys, No. 49 Varvara Lepchenko and No. 57 Christina McHale. 

The World Group play-off - which will be played at Saint Louis University - gets underway on Saturday 19 April. 

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