The 22-year-old's offences took place in October 2016, it added.
The TIU said an investigation had established that Ploskina "introduced another player to a corrupter, who offered that individual payment in return for agreeing to fix the outcome of matches."
Ploskina was also found guilty of two offences of failing to report knowledge of corrupt activity and failing to co-operate with a TIU investigation.
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The Ukrainian had a career high WTA ranking of 698 in 2014.
(Reporting by Alan Baldwin, editing by Toby Davis)
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