Notes: Jankovic is the defending champ, beating Zvonareva in the 2008 final; (3) Radwanska opens against Kirilenko; 11 Russians in the draw excluding qualifiers; a $1 million “Premier”-level event (with none of the Top 6 players?).

One day the WTA appears to have no depth, the next, more than enough depth.

Thus former No. 1 and seven-time Grand Slam winner Justine Henin of Belgium, following on the heels of countrywoman Kim Clijsters, has announced she will make a return to the women’s professional tour in 2010.

The script at this point read that Federer breaks serve early in the fourth set and wins the U.S. Open. Del Potro had other ideas and saved break points in his first two service games of the fourth set. Another tiebreak was upon both players and del Potro took advantage of a Federer double fault to win again on a single mini-break. Despite saving a break point when serving at 2-0 in the fifth set, del Potro basically dominated the final frame of play.

SERENA WILLIAMS: Well, I said something that I guess they gave me a point penalty. Unfortunately it was on match point.

“I don’t have words for this, I’m just glad I got to come back and defend my title from 2005,” Clijsters said with a smile. “I have to thank the USTA for giving me the wildcard to come back here. Winning the first one helped me to keep my nerves at the end, even though I was very, very nervous.”

Kim Clijsters and Caroline Wozniacki meet for the US Open title tonight.

Serena Williams gets defaulted in the US Open semifinal.

Can Rafael Nadal play four straight days at the US Open, and win?

Looking to join the two in the semifinals in Wednesday play will be an all-unseeded meeting with Belgian Yanina Wickmayer vs. the Ukraine’s Kateryna Bondarenko, and in the much-anticipated first night match at 7 p.m. EST, new American sweetheart Melanie Oudin vs. No. 9-seeded Dane Caroline Wozniacki.