PBT NBA Power Rankings: Heat on the top, Sixers fall to very bottom (NBC Sports)

[Yahoo! Sports - NBA -]

We have a new team at the top and the bottom of PBT’s weekly NBA Power Rankings. Miami’s defense is back and propelled them to a couple wins that have them back on top of the chart. It has taken some sustained losing — a real effort — on the part of a Sixers team…

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