FILE - In this April 29, 2012, file photo, Russia's Maria Sharapova sits on the Porsche Carrera she won after beating Belarus' Victoria Azarenka 6-1, 6-4 in the final of the Porsche Tennis Grand Prix in Stuttgart, Germany. Three of Maria Sharapova's major sponsors are cutting ties with the Russian tennis star after she acknowledged failing a doping test at the Australian Open. Sportswear giant Nike, Swiss watch brand Tag Heuer and German luxury car company Porsche moved quickly to distance themselves from the five-time Grand Slam winner after she announced the positive test at a news conference in Los Angeles on Monday, March 7, 2016. (AP Photo/Michael Probst, File)
FILE - In this April 29, 2012, file photo, Russia's Maria Sharapova sits on the Porsche Carrera she won after beating Belarus' Victoria Azarenka 6-1, 6-4 in the final of the Porsche Tennis Grand Prix in Stuttgart, Germany. Three of Maria Sharapova's major sponsors are cutting ties with the Russian tennis star after she acknowledged failing a doping test at the Australian Open. Sportswear giant Nike, Swiss watch brand Tag Heuer and German luxury car company Porsche moved quickly to distance themselves from the five-time Grand Slam winner after she announced the positive test at a news conference in Los Angeles on Monday, March 7, 2016. (AP Photo/Michael Probst, File) Michael Probst AP
FILE - In this April 29, 2012, file photo, Russia's Maria Sharapova sits on the Porsche Carrera she won after beating Belarus' Victoria Azarenka 6-1, 6-4 in the final of the Porsche Tennis Grand Prix in Stuttgart, Germany. Three of Maria Sharapova's major sponsors are cutting ties with the Russian tennis star after she acknowledged failing a doping test at the Australian Open. Sportswear giant Nike, Swiss watch brand Tag Heuer and German luxury car company Porsche moved quickly to distance themselves from the five-time Grand Slam winner after she announced the positive test at a news conference in Los Angeles on Monday, March 7, 2016. (AP Photo/Michael Probst, File) Michael Probst AP

Sharapova's brand value depends on length of tennis ban

March 11, 2016 11:51 PM

UPDATED March 11, 2016 11:51 PM

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