Federer's dramatic win an ominous sign for the field

Roger Federer has the ability to absorb everything that's thrown his way. Janko Tipsarevic was determined from the first point of this match to give everything he had. His effort against Roger was similar to that of the players who have given Federer fits in the recent past. Tipsarevic approached this match much the way Rafael Nadal and David Nalbandian have when facing the world No. 1. He ambitiously attacked from both wings and held serve consistently.

Tipsarevic's ability to maintain aggression with his serve and immediately back it up with fierce groundstrokes was instrumental. With this quick one-two offensive approach, the unheralded Serb kept Federer on the defensive. Subsequently, Roger had trouble keeping the ball deep and wasn't able to control the baseline. Tipsarevic stood toe-to-toe with perhaps the great player of all time, ending points quickly and abruptly.

Federer, though, deserves ample credit for coming through. It's a tribute to his fitness that when pushed to the brink, he doesn't let up. Throughout the match's entirety, Federer never lost a step, his shots did not deteriorate and his feet never slowed.

When a player fatigues, his lower body gives way; he doesn't have the energy or fortitude to push up from the legs and core as much. Federer, even deep into the fifth set, stayed low and his legs did not give out at any point. He can survive these matches because he is in tip-top shape.

The length and stress of this match will not hamper Federer moving forward. The more opportunity he gets to hit, the more he'll hone his game -- after having not played a single match entering the Australian Open. This Swiss maestro is not an out-of-shape veteran who can't withstand the longevity of matches. His having come through on the precipice of going down in his past two five-set matches -- the Wimbledon final vs. Nadal in '07 and Tipsarevic -- without breaking a sweat just instills more fear into his opponents. Did you even see a bead of perspiration coming from him? Tipsarevic played his heart out, but he was sweating bullets, constantly changing his shirts and shorts. Roger was gliding.

What do you think the rest of the field is thinking now? They might not tell you, but his presence liquidates a lot of their hope. Not one player in the locker room, or sitting in a hotel room, wasn't praying for Tipsarevic to pull through.

What Federer accomplished, pulling out a match separated by only a few points, is one of the most grueling physical and mental tasks a player can endure. Look at Andy Roddick. He played a nearly flawless match. He was serving his heart out, but in the end, he's not around to see the fourth round. There was never a moment in this match that Federer didn't believe he would come through.

Hopefully, these dramatics will silence some of the critics who have maligned Federer for not having to pull out tough, down-to-the-wire matches. His legacy is only amplified by the effortless nature in which he dispels the opposition. If you're not on your honor's game, Federer beats the living garbage out of you. His win against Tipsarevic was thrilling and only heightened the mental toughness that is as much a part of his repertoire as any shot in his arsenal. But Federer's legacy, right now, is the fashion is which he beats and buries his opponents across the net.

Former ATP Tour pro Luke Jensen is providing ESPN.com with analysis during the Australian Open. Jensen was a two-time All-American at USC, and is the tennis coach at Syracuse. He captured the 1993 French Open doubles crown with his brother Murphy.