12 games
11 games in 63-64
18 games in 1982
9 as of 8/5/12
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Cleveland cavaliers 26
The Chicago Cubs 2008 longest losing streak was 6 games between August 30 and September 6.
Make that 18 seasons (1992 - 2010) and counting.
That would be his current losing streak of 104 races.
23
New Jersey Nets with an 0-18 losing streak
Their longest home winning streak was 14 games