NEW YORK — It’s a sport built on names as much as talent. Tennis is different, except for golf. Most loyalties are with uniforms, no matter who’s wearing them. If you’re a Yankees fan, you’re a Yankees fan whether the guy at short is Phil Rizzuto or Derek Jeter, and that lasts forever.

Tennis players come and go all too quickly. The window closes before you know it. What happened to Andre Agassi? To Pete Sampras? To Jennifer Capriati? To Martina Navratilova?

Careers are short. Players start young and retire young. You lose a step. Or some racquet speed. And coming up quickly from behind is some 19-year-old with great skills who virtually no one’s ever heard of, especially if she or he comes from Serbia or Slovania.

To make tennis go in America particularly — and that’s where the television money comes from, where the yearly U.S. Open now underway draws 700,000 people during the two weeks — tennis needs Americans near the top or at the top, Americans who are known throughout America, if not the world.

Andy Roddick and Venus Williams fit well into that category. They and Venus’ younger sister, Serena, were about the only U.S. players who could make a showing in a Grand Slam event, about the only U.S. players who were celebrities as well as athletes.

But in a space of 24 hours, both were chased from the 2009 U.S. Open, Roddick on Saturday night by the man who might someday replace him, John Isner, and Venus on Sunday afternoon by a 26-year-old Belgian who had quit the game for two years to marry and have a baby, Kim Clijsters.

Roddick will be back. You can’t be sure of Venus. She is 29, and despite the best intentions, most tennis stars start to slip around 30, especially because their bodies begin to fail.

Venus is having left knee trouble, wearing heavy taping. One of her great assets, the ability to fly around the court, has been restricted.

Serena still is capable. She again is the favorite to repeat last year’s victory. Crushed her fourth-round opponent, Daniela Hantuchova, on Sunday at Arthur Ashe Stadium. Straight sets, a little more than an hour. The lady they call the Drama Queen, for all the incidents, was undramatic in a match that lacked any suspense.

So Serena is still here and one hopes will stay. But who’s next, who to step in for Venus and eventually, if not now, Roddick?

Maybe Melanie Oudin, the Munchkin from the suburbs of Atlanta, who beat Elena Dementieva and then the glamour lady and former champ, Maria Sharapova.

Maybe John Isner. He had 39 service aces against Roddick, who himself holds the record for all-time fastest serve, 156 mph. Pow, smash, whap.

By all rights, Isner should have been the next Tyler Hansbrough. He’s 6-foot-9 and from North Carolina. But he worked on his drop shot, not his jump shot. Then, unlike most tennis stars these days, he went to college, the University of Georgia, where he not only helped win an NCAA team title, he graduated. How about that, Dawg?

And how about the 5-foot-6 Oudin, also from Georgia? That’s not a state people think about when it comes to a new Roger Federer or Chris Evert. But that’s our problem, not Georgia’s.

Oudin was to face yet another Russian, her third in a row, Nadia Petrova, in Monday’s fourth round. Melanie doesn’t figure to keep winning.

She’s too young (17). Too inexperienced. But if she does keep winning, she has a chance to become the star America needs, after Serena and, depending on what happens, replacing Venus. If indeed Venus can be replaced.

An interesting phenomenon Sunday at Ashe Stadium. The crowd was supporting Clijsters more than it was supporting Venus Williams. Was that because Clijsters had been away and the fans were welcoming her return? Or because the Williams sisters, even as heroines, had stayed too long at the fair?

Isner said he had to play the match of his life to beat Roddick, who until the defeat had been playing the best of all the men. But if Isner is to make it to the top, as a player, as a personality, he has to have a lot of repeat performances, especially in Grand Slams. He has to rouse the curiosity of sports fans who don’t know a volley from a rally.

Is he prepared and capable? How about Melanie Oudin? So often kids make an impression, and about the time the headlines arrive, they flame and burn out.

Oudin acts humble enough, something that will endear her to the masses, but how long does that last? And how long does she last?

You’d think in a country of 300 million, more than one or two could become a tennis star.

Serena, Venus and Andy were able to do it. Is there anybody else?

As a reporter since 1960, Art Spander is a living treasure of sports history. A recipient of the Dick McCann Memorial Award — given for his long and distinguished career covering professional football — he has earned himself a spot in the Pro Football Hall of Fame. He was recently honored with the Lifetime Achievement Award by the PGA of America for 2009.

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