Tiger Woods is the top-earning American athlete according to SI's fourth annual rankings of the top 50, but he can't stay king forever. Here's a rundown of who SI thinks will one day make their way to the ranks of the top 50 earners.<br><br>No, he's not Peyton but he's only 26 and plays in the biggest media market in the nation. Do the Giants believe in him? The team exercised a buy-back of Manning's contract to keep him from becoming a free agent at the end of 2007. That made Manning $8 million richer. His salary increases to $8.45 million in 2008 and $8.95 million in 2009.
2 of 17Bob Rosato/SI
Carmelo Anthony, Denver Nuggets
Part of the famed draft class of 2003 with LeBron James and Dwyane Wade, Anthony agreed to a contract extension with the Nuggets last July, a deal two years longer than the ones James and Wade signed
3 of 17David Bergman/SI
Reggie Bush, New Orleans Saints
Everyone wants a piece of the NFL's most dynamic player not named LT. Bush, who signed a six-year, $62 million contract last year, has endorsements with Subway, EA Sports, Hummer and SportsLine.com.
4 of 17Robert Beck/SI
LaDainian Tomlinson, San Diego Chargers
He's one Super Bowl title away from being a Madison Avenue daring. Will it come this year?
5 of 17Bob Martin/SI
Rafael Nadal, ATP Tour
Nadal is already the sport's King of Clay. If he wins Wimbledon or the U.S. Open, watch out. Expect more endorsement deals as his English improves.
6 of 17Damian Strohmeyer/SI
Daisuke Matsuzaka, Boston Red Sox
In Japan, he hawks Asahi Super Dry beer and Nike, among other products. If Dice-K wins big in America, the sky's the limit. He signed a $52 million, six-year contract that could raise his base salary to as much as $12 million by 2011.
7 of 17Michael Hickey/WireImage.com
Danica Patrick, Indy Racing League
Still hasn't won a race but she's a big winner at the box office (Motorola signed her to a reported $25 million deal over three years and she also has deals with XM Satellite Radio, GoDaddy.com, Meijer, Air Tran and Argent Mortgage.) Patrick inked a deal last year with Andretti Green Racing, pairing her with another young star (Marco Andretti) as the face of the IRL.
8 of 17Al Tielemans/SI
Ben Roethlisberger, Pittsburgh Steelers
Youth, personality and moxie on his side. But stay off the bike, Ben.
9 of 17AP
Lewis Hamilton, Formula One
As the first black Formula One driver, his impact could be Tiger-esque. No rookie has burst upon the Formula One scene with such force. Hamilton, 21, has been on the podium in every race and is tied with teammate Fernando Alonso for first in the standings.
10 of 17Lou Capozzola/SI
Sidney Crosby, Pittsburgh Penguins
Gretzky 2.0? That's what the NHL is betting on. The league's leading scorer - he's 19 -- has A-list representation at the Creative Artists Agency (CAA).
11 of 17Brad Mangin/SI
David Wright, New York Mets
His good looks and aw-shucks demeanor have many predicting Wright can be Derek Jeter-esque as a product hawker. He signed a six-year, $55 million contract extension with the Mets last August.
12 of 17Getty Images/MLS/WireImage.com
Jozy Altidore, New York Red Bulls
Is the 17-year-old the next great American soccer star? It's Altidore -- and not Freddy Adu -- who appears on commercials on Major League Soccer broadcasts. And this teen boasts such sick talent and poise, it's not a stretch to think a huge future awaits him -- if not in MLS, then perhaps in one of the big European leagues.
13 of 17David E. Klutho/SI
Greg Oden, NBA draft prospect
Assuming he goes No. 1 to Portland - about the same odds as the sun coming up tomorrow - Oden can expect a four-year deal worth around $22 million. While he may not initially draw the endorsements of Shaq or LeBron, he is repped by Mike Conley Sr., who just signed with BDA Sports Management, the second-largest agency working with NBA players.
14 of 17Richard Schultz/WireImage.com
Ryan Howard, Philadelphia Phillies
Gentle giant has Ruthian appeal. With representation at CAA, look for some major deals in '08, including a new contract.
15 of 17Greg Nelson/SI
Kevin Durant, NBA Draft prospect
The Sonics might have to throw in the Space Needle in a couple of years to keep him. At 6-10, he has three-point range and freakish athleticism.
16 of 17Tom Cammett/WireImage.com
Brady Quinn, Cleveland Browns
With his Notre Dame pedigree and good looks, Quinn can be a financial powerhouse. That is, if he can play.
17 of 17Brad Mangin/SI
JaMarcus Russell, Oakland Raiders
Charisma, and a monster arm, but can he overcome playing for the Raiders?
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