It’s been a topspin-turvey season in men’s tennis, or so we're told. Taking in all of the results, all of the hype and headlines, and all of the heated arguments and blogs online, you get the unmistakable feeling that a revolution is imminent. You sense that Roger Federer is in a serious slump and his days of dominance are over; that his most reliable foil, Rafael Nadal, is finally breaking down physically; and that Novak Djokovic and a legion of upstarts are pushing the ATP Tour to the brink of parity.

These story lines were highlighted this past week in Rome, where Radek Stepanek didn’t just beat Federer but outplayed and outsmarted him, Nadal lost meekly to Juan Carlos Ferrero because of a foot injury, and Djokovic added another trophy to his collection.

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TOO CLOSE TO CALL   Figuring out who currently leads the pack is no easy task on either the men's or women's tour. Ranking (past 52 weeks) 1. Roger Federer                  6825 points2. Rafael Nadal                    54353. Novak Djokovic                 5125   1. Justine Henin                   56952. Maria Sharapova               39863. Ana Ivanovic                    3922 Race (year so far) 1. Novak Djokovic                  476 points2. Rafael Nadal                     4103. Roger Federer                   290 1. Maria Sharapova              20602. Ana Ivanovic                    16703. Jelena Jankovic                1625 Season Earnings 1. Novak Djokovic                $2.6 million2. Rafael Nadal                   $1.7 million3. Nikolay Davydenko          $1.1  million 1. Maria Sharapova             $1.8 million2. Serena Williams              $1.1  million3. Ana Ivanovic                   $1.1  million Season Winning % (15+ matches) 1. Novak Djokovic                 86%2. Rafael Nadal                    82%3. Andy Roddick                   81% 1. Maria Sharapova               92%2. Serena Williams                91%3. Lindsay Davenport             87% Most matches won 1. Rafael Nadal                    31 matches2. Novak Djokovic                 253. Nikolay Davydenko            25 1. Vera Zvonareva                 302. Jelena Jankovic                 243. Maria Sharapova               22

But are things really that different from where we were this time last season? The buzz says yes, the stats suggest otherwise. Comparing Federer's, Nadal's, and Djokovic's results in 2008 against their performances in 2007, you realize that not much has changed.

Federer¹s record this year is 22-6 with 1 title; last year he was 19-4 with two titles (granted, one of them was the Australian Open). Nadal is 32-7 with two titles; last season he was 33-5 with four titles. Djokovic is 25-5 with three titles; last season he was 32-7 with three titles.

It’s interesting to note that Djokovic, considered the hottest player on the tour, has virtually the same winning percentage this season, at 83 percent, as he did this time last year, when he’d won 82 percent of his matches. Federer’s winning percentage has only dropped from 83 percent in 2007 to its current 79 percent. Nadal has seen the biggest drop in winning percentages year-on-year, going from 87 percent to 82 percent. It’s significant, particularly given that he's won two fewer titles, though this hardly suggests a seismic shift in the balance of power.

Two other players who’ve gotten a lot of attention this season are Andy Roddick and Nikolay Davydenko. Through Rome, Roddick is 24-5 with two titles; over the same time frame last year, he was 20-6 without any tournament victories. Davydenko is 28-8 with one title compared to 20-8 and no hardware last year. Roddick has improved his winning percentage 8 points, from 77 to 83 percent, while Davydenko has seen his results go up 6 points, from 71 to 78 percent.

Clearly, it doesn’t take much in the top flight of men's tennis to create the impression that the established order is crumbling. A couple losses here, a couple wins there, and there's talk about slumps and surges that seems a bit premature. Only just, though. The next few weeks, with the French and Wimbledon looming, will be critical. As the statistics demonstrate, it won't take much for Nadal and Federer to fortify their spots. It also won't take much to turn their 2008 campaigns into disappointments.

First up, Paris. Based on the current form, confidence, and health of the game¹s big three, Roland Garros will be the most open French Open in recent memory. Wimbledon could be much the same.

Federer and Nadal must deal with the pressure that their stranglehold on the top 2 spots will end based not on a season-long slide (again, their performances have been, year-to-year, virtually identical) but by an odd upset or two.

It’s often said that tennis is a game of inches. Who knew that establishing the game’s pecking order operated under such fine margins, too?