1971-72 Los Angeles Lakers The team went 33 matches unbeaten
An NBA team needs to win 16 playoff games to be NBA champions.
36 wins are needed to be in playoff.
For 2009, no one did.
The Los Angeles Lakers
If you are talking about the NFL, NHL, NBA and MLB then the answer is the Chicago Cubs who have not won a championship since 1908.There are a number of teams that have never won a championship, but the Cubs 101 years without a title is the longest drought.Coincidentally, MLB has been around the longest.Longest championship drought in NBA: Sacramento Kings(1951, when the team was the Rochester Royals)Longest championship drought in NHL: Chicago Blackhawks(1960-1961)Longest championship drought in NFL: Arizona Cardinals(1947, then located in Chicago)