Who rules after Fed and Rafa, trouble with doubles

	Novak Djokovic's run of success has seen him vault to No. 3 in the rankings. Bob Martin/SI
	MAILBAG Jon Wertheim will answer questions from SI.com users in his mailbag every Wednesday. Your name: Your e-mail address: Your home town: Enter your question:

OK, so after Roger Federer and Rafael Nadal, who are your next five best men's players?
-- Daniel, Los Angeles

At this particular moment? With no consideration of surface? Heading into hard-court season? Give me: Novak Djokovic, Mikhail Youzhny, Andy Roddick, Richard Gasquet and a healthy Andy Murray. I put a buy rating on Marcos Baghdatis, a sell rating on James Blake, Ivan Ljubicic and Fernando Gonzalez. Nikolay Davydenko is a neutral but I just can't get jazzed about him right now. Ask me again in five weeks, though, and I'm sure the answer will be different.

Do you think we will ever again see a tennis player capable of playing at a high level in both singles and doubles the way John McEnroe or Yevgeny Kafelnikov did?
-- Alex Ketaineck, Madison, N.J.

Doubt it. There's simply not enough incentive to play doubles, especially when certain Grand Slams (ahem, ahem) mandate best-of-five matches. We got a vivid demonstration at Wimbledon regarding just how grueling this sport is on singles guys. Imagine if Djokovic, Youzhny or Gasquet decided to play doubles in addition to singles.

I also think we should give the doubles specialists some credit here, though. Partly by professional necessity and partly because they're not distracted with singles, doubles guys, led by the Bryans, have refined the art. I bet most teams -- say the Wimbledon champs, Michael Llodra and Arnaud Clement -- would beat Nadal and Federer seven times out of 10. (Having written that, I just saw that Roddick and Mardy Fish beat Mahesh Bhupathi and Paul Hanley in Indianapolis.)

Is there a book you can recommend on what professional tennis was like before the Open era?
-- Blake Redabaugh, Denver

Try this.

Do you agree with me that the worst thing we can say about Federer is that he would lose some of his looks if he suddenly became toothless?
-- J.J. Johnson, Allentown, Pa.

I hear that sometimes he neglects to floss after meals.

I enjoyed your link to Bjorn Börg's obsession with selling his tennis paraphernalia. How appropriate that his racquet was advertised as "with original head case."
-- Andrew Simon, Hong Kong

Marat Safin presumably has the knock-off.

Denial, thy name is J. Wertheim. And Nadal is better than Roddick on grass; the record speaks for itself.

-- Susan Freeman, San Francisco

Duly conceded.

Now with equal pay for the women, how about three sets for both men and women until the round of 16, and best-of-five for both afterwards? No log jams in Week 1, more tennis with the best of them in Week 2. And an end to all the equal pay for equal play headlines.
-- Anirban Mukherjee, Jersey City, N.J.

Not bad. There were murmurs last week that the women might play a best-of-five finals at some Slams -- people have gotten sick of these 70-minute, straight-set whitewashes.