Tony McCoy created a special piece of racing history this week when he ran in his 4,000th career winner - a remarkable achievement in such a tough sport as jumps racing, but is he the most dominant champion we've seen in sport?
Steffi Graf
With 22 grand slam titles to her name, Graf leads the way in singles titles in the Open era of tennis, and she spent the longest period at World No 1 of any player, male or female, since the rankings came in with a whopping 377 weeks at the top of the tree. Graf also holds the record of winning the only Calendar Year Golden Slam when she cleaned up the four majors and the Olympic gold medal in 1988. She won five consecutive slams in that period and seven of the eight in two years.
Australian Rugby League
The Kangaroos are the most dominant international side in the 13-man code of rugby, and have showcased this dominance by being the team to beat in the Rugby League World Cup. Although they finished third in the inaugural tournament back in 1954, they have won nine of the remaining 12 tournaments and appeared in every single final since then - losing out to Great Britain twice and New Zealand last time out in 2008.
Stephen Hendry
The youngest World Snooker champion at age 21, Hendry went on to claim a record seven Crucible titles and held the World No 1 spot for eight consecutive years from 1990-98. He also holds the record for most world ranking titles with 36 and is also top of the pile with 775 competitive centuries. He won five straight Crucible crowns and six in seven years during his pomp, and twice he won the world title, UK Championship and Masters in the same year.
Roger Federer
He may look a little past his best these days, but Federer is still the best men's player we've seen with him claiming 17 grand slam titles and holding the World No 1 spot for 302 weeks overall and a streak of 237 consecutive weeks. He is one of just three men alongside Nadal and Agassi to win the career grand slam on three different surfaces and also holds a share of the record number of tournament wins at the Australian and US Open and Wimbledon. He may be getting on but he might just have one more slam title in him.
Rocky Marciano
A rarity in boxing with Marciano one of the few fighters who managed to keep their unbeaten record into retirement - and the only heavyweight to retire with a zero in the loss column. Marciano won the heavyweight title from Jersey Joe Walcott in 1952 and defended it six times before heading into retirement with a blemish-free record of 49-0.
