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The Los Angeles Lakers won the NBA Finals last season.
Their record over the last nine games of the regular season was 3-6.
Therefore, it is safe to say that they did well in the playoffs, despite entering with little momentum.
What's more, the 2009-10 Lakers' opponent in the NBA Finals was the Boston Celtics.
The Celtics won only three of their final 10 games at the end of the regular season.
So they too experienced a good deal of playoff success without late-season momentum.
But these aren't isolated examples; since the playoff format changed in 2003, there have been three other NBA champions which entered the postseason with substantial cold streaks—namely the 2004-05 San Antonio Spurs (went 1-3), the 2005-06 Miami Heat (went 4-7 with a season-ending three-game skid) and the 2006-07 Spurs (dropped final three games).
So considering that four of the last eight NBA champions have entered the playoffs without momentum, it seems as though teams' late-season performances have been largely overrated.