Four-time Grand Slam doubles champ Stosur: Double trouble

Editor's note: Four-time Grand Slam doubles champion Samantha Stosur writes exclusively for Yahoo! Sports during the U.S. Open. Stosur and Lisa Raymond won the U.S. Open in 2005 and the Australian has also lifted her singles ranking to No.15. She offers her thoughts courtesy of Lacoste.

Any time Venus and Serena Williams show up for a Grand Slam doubles tournament you know they are in it to win it.

The Williams sisters are a great doubles team and having them in the draw is obviously going to make it harder to win, but I think it's great for the game when they take part.

The WTA Tour has done a good job of raising the profile of the doubles events in recent years and there is certainly more interest in doubles now than when I started my career.

However, having the Williamses involved kicks things up to a whole new level and it is great to see doubles getting that extra exposure.

My partner Rennae Stubbs and I would love to take up the challenge of playing them in the final, but we have got some important business to take care of in the semifinals first.

We take on No.1 seeds Cara Black and Liezel Huber on Friday and I would love to have the chance to reach the final and win this title again.

I have concentrated more on singles this year and I took a lot of confidence from reaching the semifinal of the French Open.

I don't train specifically for doubles and I am pretty focused on improving my singles ranking - but after going out early in the singles here the doubles have become my total priority.

It would be great to walk out of Flushing Meadows with the trophy this weekend.

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