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The complete history of the NBA Draft Lottery

The lottery system was first implemented in 1985 and has seen multiple tweaks and big upsets over the years.

The 31st NBA Draft Lottery will take place on Tuesday night in New York. The first ever lottery took place in 1985, when the New York Knicks won the top pick and selected Patrick Ewing.

In the first drafts, teams simply picked in reverse order of their win-loss record. There was also a special territorial-pick rule that allowed a team to draft a player from the local area, although that team then lost their first-round pick if the territorial pick was used. The draft system was changed in 1966 to feature a coin flip between the worst teams in each division, and that system stayed in place until that first lottery in 1985.

The first version of the lottery involved envelopes of the non-playoff teams being selected out of a hopper, with every team having the same chance at the top pick. There was controversy surrounding the Knicks' victory in that debut lottery, because some thought the NBA rigged it by making it easy to tell which envelope belonged to New York. Despite the criticism surrounding the envelope system, it remained through 1989, although a tweak was made in 1987 that made it so the lottery only determined the top three picks.

The weighted lottery system was introduced in 1990 and remains to this day, albeit with a few changes. This weighted system meant the team with the worst record finally got the best chance to earn the top pick. However, since this system was implemented, the team with the worst record has only won the lottery three times.

The New Jersey Nets earned the top pick with the worst record in the first year of the weighted system and chose Derrick Coleman. The next time it happened wasn't until 2003, when the Cleveland Cavaliers won the right to select LeBron James after finishing the year tied for worst in the league. The next year, the Orlando Magic finished last in the NBA and won the lottery, and that top pick turned into Dwight Howard.

The worst team in the league hasn't won the lottery since the Magic in 2004, and the Minnesota Timberwolves hope to buck that trend this year.

The biggest winners in lottery history are the Los Angeles Clippers, Cavaliers and Magic. The Clippers have won the lottery five times (1986, 1988, 1998, 2009, 2011), but two of those top picks have gone to other teams because of trades. Cleveland has won the lottery three times (2003, 2013, 2014) and also got the 2011 top pick from Los Angeles. The Cavaliers chose Kyrie Irving that year.

In addition to winning the lottery in 2004, the Magic also won in 1992 and 1993. Orlando took Shaquille O'Neal with the first pick in 1992 and Chris Webber in 1993, although Webber was subsequently traded to the Golden State Warriors for Penny Hardaway and three future first-round picks.

Orlando's victory in 1993 was the biggest upset in lottery history. The Magic had just a 1.52 percent chance of winning that year. The Cavaliers only had a 1.7 percent chance of winning in 2014, and that pick turned into Andrew Wiggins, who was then traded for Kevin Love. The Chicago Bulls also only had a 1.7 percent chance when they won in 2008 and selected Derrick Rose first overall.

Here's a look at the full history of the lottery:

Year Team Previous season record Probability of winning lottery Player selected
1985 Knicks 24-58 (3rd-worst) 14.29% Patrick Ewing
1986 Clippers (to Cavaliers via 76ers) 32-50 (7th-worst) 14.29% Brad Daugherty
1987 Spurs 28-54 (4th-worst) 14.29% David Robinson
1988 Clippers 17-65 (Worst) 14.29% Danny Manning
1989 Kings 27-55 (6th-worst) 11.11% Pervis Ellison
1990 Nets 17-65 (Worst) 16.67% Derrick Coleman
1991 Charlotte Hornets 26-56 (5th-worst) 10.61% Larry Johnson
1992 Magic 21-61 (2nd-worst) 15.15% Shaquille O'Neal
1993 Magic 41-41 (11th-worst) 1.52% Chris Webber
1994 Bucks 20-62 (2nd-worst) 16.30% Glenn Robinson
1995 Warriors 26-56 (5th-worst) 9.4% Joe Smith
1996 76ers 18-64 (2nd-worst) 33.73% Allen Iverson
1997 Spurs 20-62 (3rd-worst) 21.60% Tim Duncan
1998 Clippers 17-65 (3rd-worst) 22.56% Michael Olowokandi
1999 Bulls 13-37 (3rd-worst) 15.70% Elton Brand
2000 Nets 31-51 (7th-worst) 4.40% Kenyon Martin
2001 Wizards 19-63 (3rd-worst) 15.70% Kwame Brown
2002 Rockets 28-54 (5th-worst) 8.90% Yao Ming
2003 Cavaliers 17-65 (T-Worst) 22.50% LeBron James
2004 Magic 21-61 (Worst) 25.00% Dwight Howard
2005 Bucks 30-52 (6th-worst) 6.30% Andrew Bogut
2006 Raptors 27-55 (5th-worst) 8.80% Andrea Bargnani
2007 Trail Blazers 32-50 (6th-worst) 5.30% Greg Oden
2008 Bulls 33-49 (9th-worst) 1.70% Derrick Rose
2009 Clippers 19-63 (2nd-worst) 17.70% Blake Griffin
2010 Wizards 26-56 (5th-worst) 10.30% John Wall
2011 Clippers (to Cavaliers) 32-50 (8th-worst) 2.80% Kyrie Irving
2012 New Orleans Hornets 21-45 (T-3rd-worst) 13.70% Anthony Davis
2013 Cavaliers 24-58 (3rd-worst) 15.60% Anthony Bennett
2014 Cavaliers 33-49 (9th-worst) 1.70% Andrew Wiggins