I don't normally copy internet articles here but I found this interesting. Here is the list compiled by Foxsports. I see no indication if they supposed to be starting with the worst or counting down to the worst or what.
Lance Armstrong's Tour de France winning streak
Michael Strahan's NFL sack record
Marite Koch, 400-meter world record
Si-Hun Park, 1988 light-middleweight Olympic champ
Marion Jones, three gold medals, 2000 Olympics
Richard Petty's 200 victories
Nykesha Sales, UConn career scoring record
USSR basketball gold medal, 1972 Olympics
Gordie Howe's sixth decade of hockey
Yelena Berezhnaya and Anton Sikharulidze, 2002 gold medal
Argentina's 1986 World Cup victory
Here is some fleshing out of those scenarios.
Lance Armstrong's Tour de France winning streak
Michael Strahan's NFL sack record
Marite Koch, 400-meter world record
Si-Hun Park, 1988 light-middleweight Olympic champ
Marion Jones, three gold medals, 2000 Olympics
Richard Petty's 200 victories
Nykesha Sales, UConn career scoring record
USSR basketball gold medal, 1972 Olympics
Gordie Howe's sixth decade of hockey
Yelena Berezhnaya and Anton Sikharulidze, 2002 gold medal
Argentina's 1986 World Cup victory
Here is some fleshing out of those scenarios.