Washington beat Detroit 96-80 on the final day of the NBA regular season to set up a first-round play-off match-up against Cleveland.
Top seeds Pistons will meet the eighth seeds Milwaukee when post-season action begins on Saturday, 22 April.
Indianapolis beat Orlando 89-83 to become sixth seeds in the East and a series against third seeds New Jersey.
Chicago saw off Toronto 127-106 to earn seventh seeding in the East and a first-round meeting with Miami.
In the West, Kobe Bryant scored 35 points to claim his first NBA scoring crown as the Lakers beat New Orleans 115-95 to enter the play-offs riding a five-game victory streak.
The Lakers take on the Phoenix Suns in a first-round clash featuring two of the league's top MVP candidates, Bryant and Suns guard Steve Nash.
The LA Clippers will face the Northwest division champions Denver who will limp into the play-offs on a four-game losing streak after a 109-98 defeat by Seattle.
SuperSonics star Ray Allen broke the NBA's single-season record for three-pointers.
He made seven-of-13 from the arc to finish the 2005-06 campaign with 269 3-pointers, breaking the mark set by Dennis Scott in 1995-1996.
Allen's career total is now 1,755, second on the all-time list behind Reggie Miller.
Dallas will open against Memphis who closed out the regular season with a 102-92 double overtime victory over Minnesota.
NBA play-offs (all series best of seven games):
Eastern Conference:
Detroit v Milwaukee
Miami v Chicago
Indiana v New Jersey
Washington v Cleveland
Western Conference:
Sacramento v San Antonio
Phoenix v LA Lakers
LA Clippers v Denver
Memphis v Dallas