Dirk Nowitzki

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Memphis Grizzlies center Marc Gasol (33), of Spain, goes to the basket against Dallas Mavericks guard Monta Ellis (11) and forward Dirk Nowitzki, of Germany, during the first half of an NBA basketball game Wednesday, April 16, 2014, in Memphis, Tenn. (AP Photo/Lance Murphey)

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Dallas Mavericks forward Dirk Nowitzki, right, of Germany, get close defense from Phoenix Suns forward Channing Frye (8) during the first half of an NBA basketball game on Saturday, April 12, 2014, in Dallas. (AP Photo/LM Otero)

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Dallas Mavericks' Dirk Nowitzki, right, falls as he is guarded by Phoenix Suns' Channing Frye, left, in the first quarter of an NBA basketball game in Dallas, Saturday, April 12, 2014. (AP Photo/Dallas Morning News, Louis DeLuca) MANDATORY CREDIT; NO SALES; MAGAZINES OUT; TV OUT; INTERNET USE BY AP MEMBERS ONLY

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San Antonio Spurs forward Tim Duncan (21) shoots against Dallas Mavericks forward Dirk Nowitzki (41) during the first half an NBA basketball game Thursday, April 10, 2014, in Dallas. (AP Photo/LM Otero)

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Dallas Mavericks forward Dirk Nowitzki (41) shoots against San Antonio Spurs center Tiago Splitter during the first half an NBA basketball game Thursday, April 10, 2014, in Dallas. (AP Photo/LM Otero)

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Dallas Mavericks forward Dirk Nowitzki, of Germany, drives to the basket against Sacramento Kings center DeMarcus Cousins, left, during the first quarter of an NBA basketball game, Sunday, April 6, 2014, in Sacramento, Calif.(AP Photo/Rich Pedroncelli)

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Dallas Mavericks forward Dirk Nowitzki, left, of Germany, is double-teamed by Los Angeles Lakers forward Ryan Kelly (4) and guard Jodie Meeks, right, during the first half of an NBA basketball game, Friday, April 4, 2014, in Los Angeles.(AP Photo/Gus Ruelas)