Lance Armstrong -- Tour de France Champion (1999-2005)
OK, technically this is a seven-peat, but that's even more of a reason to put Armstrong's Tour de France dominance at the top of the list. Among the best cyclists in the world, Armstrong left the sport in 1996 after learning testicular cancer had spread throughout his body. As if surviving the illness wasn't impressive enough, he came back better than ever and established a new mark in the sport.
New York Islanders -- NHL Stanley Cup Champions (1980-1983)
Ever hear of Wayne Gretzky, Paul Coffey and Mark Messier? In 1983, they were on the losing end of the Stanley Cup finals when the Oilers were swept by the Islanders on the way to their fourth championship in a row. And consider this: When the Islanders won their first Cup in 1980, they had existed for less than 10 years. Quite an accomplishment for any team, much less than one living in the shadow of the Rangers in Manhattan.
Michael Schumacher -- Formula One World Champion (2000-2004)
Schumacher, the seven-time World Champion, won five driver's titles from 2000 to 2004, driving a Ferrari over 200 mph while making left- and right-hand turns. And in 2000 and 2001, Forbes ranked him as the highest paid athlete in the world, besting even Tiger Woods and Michael Jordan.
Martina Navratilova -- Wimbledon Champion (1982-1987)
Deemed one of the greatest tennis players by many of her rivals, Navratilova truly left her mark on the sport at Wimbledon. With two Wimbledon singles titles already on her mantel, she began her domination at the All England Club in 1982. As impressive as this mark is, it could have been even better had she not lost to Steffi Graf in the finals of 1988 and 1989 (Navratilova won her final Wimbledon singles title in 1990).
Jimmie Johnson -- NASCAR Cup Champion (2006-2008)
To put Johnson's achievement in perspective, consider this: In 60 years of Cup competition, there have been two three-peats. Compare that to 10 occurrences in the NBA (61 years) and nine times in the NHL (80 years). Also, unlike NASCAR's first triple-threat, Cale Yarborough, who ran at a time when there were on average seven different race winners per season and just about 12 drivers ran full time, Johnson's trifecta came at a time when there were just under 14 different winners per year with well over 30 drivers competing year round.
Rafael Nadal -- French Open Champion (2005-2008)
In an era dominated by Roger Federer, Nadal put himself on the tennis scene in 2004 with a stout performance in his Wimbledon debut, where he reached the third round. However, it was his debut on the clay courts of the French Open in 2005 that made him a star as he defeated the mighty Federer on his way to the championship that year. Nadal continued overwhelming the competition since then, winning the title the next three years and counting.
Chicago Bulls -- NBA World Champions (1991-1993)
The Bulls finally broke through to win a title in 1991, then went on to do it the next two years before Michael Jordan abruptly retired to play baseball. Scottie Pippen couldn't keep it going alone, but when Jordan returned for the 1995-96 season, the Bulls reeled off three more for the repeat-threepeat.
Andrew D. Bernstein
New York Yankees -- MLB World Champions (1998-2000)
The compilation of Yankees stars joined baseball lore in 1998, winning an eye-popping 114 games in the regular season en route to beating the San Diego Padres in the World Series. While it proved difficult to return to their level of regular season success, the Joe Torre-led Yanks continued their championship prowess until being derailed by the Arizona Diamondbacks in 2001.
TIMOTHY A. CLARY
Tiger Woods -- U.S. Amateur Champion (1994-1996)
Ever wonder how Tiger Woods became the most famous golfer in the world? Sure, there was the putting contest with Bob Hope at age 2, but Woods thrust himself into the spotlight with his back-to-back-to-back U.S. Amateur titles beginning in 1994 -- proving that he could live up to and beyond expectations even at a young age. While no longer the youngest amateur to win the title, he remains the only one to complete the trifecta.
UCLA Bruins -- NCAA Basketball Champions (1967-1973)
Under the direction of coaching legend John Wooden, future Hall of Famers like Kareem Abdul-Jabbar (1966-69) and Bill Walton (1971-74, pictured) set the standard for team domination, going a perfect 30-0 three times and losing just five times in 210 games over that span.