One more win each, and Serena Williams (above) and sister Venus will meet in the U.S. Open quarterfinals. AP Jon Wertheim's Mailbag Jon Wertheim will answer questions from SI.com users in his mailbag every Wednesday. Name: Email: Hometown: Question: SEND Follow Jon Wertheim on Twitter

Headed into final week of the final Grand Slam, here are out midterm grades:

A

Men's seeds: Rafael Nadal, Roger Federer, Novak Djokovic, Andy Murray and Andy Roddick -- the top five contenders at the tournament's start -- breeze into Week 2.

Williams-Williams: Two of the few sources of stability in the women's game right now breeze through early rounds. Just a shame they're slated in the same quarter of the draw.

Anna Lena Groenefeld: Former top 20 player who disappeared into the ranking hinterlands roars back.

Sam Querrey: American not only cruises through to Round 4 -- and gets the television date against Nadal -- but manages to use "boom goes the dynamite" in a news conference.

Fandom: Thanks in part to cooperative weather so far, the U.S. Open is set to shatter attendance records. Sure, the lines can resemble Disneyworld. But it beats the alternative.

Teenagers: Juan Martin del Potro, Marin Cilic and Kei Nishikori (and even Ernests Gulbis in defeat) live up to hype.

A-minus

The Green Initiative: Good for the USTA for being proactive.

But there's still massive room for improvement. One example: do any red carpet guests not arrive in private SUVs?

Julie Coin: Pride of Clemson tennis, this French qualifier scores one of the bigger upsets in recent memory, taking out top seed Ana Ivanovic. Then loses a winnable match against Amelie Mauresmo.

B

Donald Young: Young American shows his abundant talent in five-set first rounder against James Blake. Also reveals how far he is from a finished product.

Mother Russia: Plenty of the country's top players are out -- including non-starter Maria Sharapova. But the two best bets for a title, Elena Dementieva and Dinara Safina, remain.

Jelena Jankovic: Serb is hardly making things easy on herself, but as of this writing she's still in the draw.

American women: Some fine efforts and encouraging results. But as usual, only the Williams sisters survive the early rounds.

C

Ana Ivanovic: Hard to recall a player whose game has fallen faster since reaching No. 1. Serb bows out in Round 2, the victim of one of the bigger upsets in recent memory.

Richard Gasquet: Is there a cardiologist in the house? Hyper-talented Frenchman loses another five-setter.

Tomas Berdych: Boy, is this escalator headed in the wrong direction. Czech served off the court by Sam Querrey, 6-3, 6-1, 6-2, in Round 1.

Anna Chakvetadze: Semifinalist last year doesn't survive first round.

Empty suits in near-empty suites: It's a minor tragedy that common tennis fans can't acquire tickets while so many corporate boxes remain unoccupied.