1. Andre Agassi John Russell / Getty, GLYN KIRK / Getty Fact: Andre Agassi was the first male tennis player to win a grand-slam tournament on all three surfaces: grass, clay, and hard courts. 2. Mark McGwire Tom Hauck / Getty, Rob Tringali / Getty Fact: Mark McGwire ranks first in the AB/HR stat (at bats per home run), which measures the frequency at which players hit home runs. Second on that list: Babe Ruth. 3. Michael Jordan Getty Images, Chip Somodevilla / Getty Fact: In the 1986 NBA playoffs, Michael Jordan and the Bulls faced Larry Bird and the Celtics, one of the all-time great teams. In Game 2, Jordan set a playoff record against the highly touted squad by scoring 63 points in a single game. Later, Bird called Jordan, "just God disguised as Michael Jordan." 4. Mike Tyson JOHN RUTHROFF / Getty, Jesse Grant / Getty Fact: Mike Tyson wasn't even old enough to drink when he knocked out Trevor Berbick to become the youngest heavyweight champion in the sport's history. Berbick was 33. Tyson? Only 20 years old. 5. Sammy Sosa DANIEL LIPPITT / Getty, Romain Maurice / Getty Fact: Sammy Sosa is ranked eighth overall in home runs, having hit 609 in his 18-year career. 6. Brett Favre Scott Halleran / Getty, Hannah Foslien / Getty Fact: Brett Favre set numerous records during his career, a few of which have been broken since his retirement in 2010. But one record in particular looks almost untouchable: his 297 consecutive regular-season starts (321 if you count the postseason). He didn't miss a single game from 1992–2010. 7. Penny Hardaway Jonathan Daniel / Getty, instagram.com Fact: Penny Hardaway and Shaquille O'Neal began their careers together playing for the Orlando Magic in the early '90s. They reunited in 2007, this time on the Miami Heat. That was Hardaway's final season in the league. 8. Wayne Gretzky Mike Powell / Getty, Bruce Bennett / Getty Fact: Wayne Gretzky is nicknamed "the Great One" due to the fact that he's widely considered to be the greatest hockey player ever. He still holds 60 NHL records despite retiring in 1999. 9. Jerry Rice Todd Warshaw / Getty, Michael Loccisano / Getty Fact: Jerry Rice's career spanned 20 seasons. In that time, he set numerous records. He's the all-time leader in receiving yards with 22,895. Second place is not even close (Terrell Owens with 15,934). 10. Mia Hamm Andy Lyons / Getty, Valerio Pennicino / Getty Fact: When Mia Hamm retired in 2004, she had scored the most international goals (158), a stat that included both men and women. She also made Pelé's list of the 125 greatest living soccer players. 11. Michael Johnson Tony Duffy / Getty, Clive Mason / Getty Fact: As a kid, Michael Johnson was mocked for his upright running style. They would say he ran "funny." When he went pro, commentators would say, "He could be the world record holder if he changes his running style." He ultimately proved them all wrong and went on to win 13 gold medals. 12. Nancy Kerrigan Phil Cole / Getty, Michael Loccisano / Getty Fact: Despite being well-known for having been attacked with a police baton in an attempt to remove her from the 1994 Winter Olympics, she recovered quickly and went on to win the Silver Medal. 13. Bruce Smith WAYNE SCARBERRY / Getty, Brett Carlsen / Getty Fact: Bruce Smith, aka the Bad Things Man, is the all-time sack leader with 200 career sacks. 14. Michelle Kwan TORU YAMANAKA / Getty, Theo Wargo / Getty Fact: Despite retiring in 2006, Kwan remains one of the most decorated figure skaters in the history of the sport. 15. Bo Jackson Otto Greule Jr / Getty, Jeff Gross / Getty Fact: Bo Jackson is the first athlete ever to be an all-star in both pro football and pro baseball. And despite his legendary athleticism, he doesn't think he would've been able to do it today. "The talent pool is that deep now [...} If you try to do both you're going to be riding the bench in both." 16. Dennis Rodman Jonathan Daniel / Getty, instagram.com Fact: Dennis Rodman was one of the best rebounders the NBA had ever seen, and he led the league in rebounds per game seven years in a row. 17. Dominique Dawes Otto Greule Jr / Getty, Facebook: 195040886586 Fact: Dominique Dawes was the first black woman to both make the US Olympic team in gymnastics and to win an individual Olympic Medal in gymnastics. 18. Patrick Ewing TIMOTHY A. CLARY / Getty, Mitchell Layton / Getty Fact: Patrick Ewing has been inducted into the Basketball Hall of Fame not once, but twice. The first enshrinement was for his career, the second for his role on the 1992 Olympic team, better known as the "Dream Team." 19. Monica Seles Getty Images, Clive Brunskill / Getty Fact: Monica Seles won nine total Grand Slam titles and was number one in the world for 178 weeks. If not for a vicious knife attack that kept her from the sport for two years, some believed she would have become the most accomplished female player ever. 20. Randy Johnson DANIEL LIPPITT / Getty, instagram.com Fact: Randy Johnson holds the distinction of being the oldest player to pitch a perfect game in MLB history. He was 40 at the time. 21. Ronaldo Luís Nazário de Lima Mark Thompson / Getty, Paolo Bruno / Getty Fact: The original "Ronaldo," Ronaldo Luís Nazário de Lima is considered one of the sport's all-time greats. He was only 20 when he won his first of three FIFA World Player of the Year awards. 22. Ken Griffey Jr. Stephen Dunn / Getty, Otto Greule Jr / Getty Fact: Ken Griffey Jr. hit 630 home runs in his storied career, the sixth most of all time. He's also tied for first for most consecutive games hitting a home run (eight). 23. Tiger Woods JEFF HAYNES / Getty, Rob Kim / Getty Fact: When Tiger Woods won his first Masters tournament at the age of 21, he was the youngest golfer to ever do so. Not only that, but he won by 12 strokes, the widest margin of victory in the history of the tournament. 24. Deion Sanders Al Bello / Getty, Bryan Bedder / Getty Fact: Like Bo Jackson, Deion Sanders played both pro football and pro baseball, and he's consider the last superstar to do so. He has the honor of being the only player to play in both a Super Bowl and a World Series. 25. Evander Holyfield Simon Bruty / Getty, David A. Smith / Getty Fact: Over the course of his career, Holyfield won the heavyweight title four different times. In so doing, he surpassed Muhammad Ali's record, who had done it three times. 26. Charles Barkley Vince Bucci / AFP / Getty Images, Theo Wargo / Getty Fact: Like Ewing, Barkley also earned two Hall of Fame inductions for both his personal career and for being on the 1992 Olympic "Dream Team." He was also the league MVP in 1993. 27. Barry Sanders JEFF KOWALSKY / Getty, Dave Reginek / Getty Fact: Barry Sanders has been called the most elusive runner in NFL history, the best player to never see a Super Bowl, and the 1997 league MVP. With these in mind, here's an odd stat for you: Sanders holds the record for most yards lost by a running back, having gained 1,114 career yards in the wrong direction. 28. Jeff Gordon David Taylor / Getty, Jamie McCarthy / Getty Fun Fact: When Jeff Gordon won his first Cup Series championship in 1995, he was the youngest driver to ever do so. At the award ceremony, he toasted with milk instead of champagne. 29. Christian Laettner Rick Stewart / Getty, Tim Bradbury / Getty Fun Fact: Christian Laettner, whose game-winning shot against the Kentucky Wildcats still lives on in the memories of college basketball fans everywhere, was allegedly one of the most hated players in college basketball. There's even an ESPN 30 For 30 about it titled I Hate Christian Laettner.