Errani, victor of five Grand Slam doubles titles and ranked 72nd in the singles standings, was initially banned for two months by the International Tennis Federation (ITF) in August 2017 and her results from February 16 to June 7 that year were declared void.
The Italian, a Roland Garros finalist in 2012, was suspended for two months in August 2017 by an independent tribunal of the Italian Tennis Federation after she failed an out-of-competition test, administered at her family home, last February.
Errani, victor of five Grand Slam doubles titles and ranked 75th in the singles standings, was initially banned for two months by the International Tennis Federation (ITF) in August 2017 and her results from February 16 to June 7 that year were declared void.
The CAS said, however, that the "personal departure from the objective and subjective standards of care, expected to be exercised by her, together with her mother's fault which is imputed to her" amounted to a "light degree" of fault. The two months that Errani served a year ago are deducted from that total. And now they want to add an extra sanction of eight months.
"The CAS Panel upheld the Italian National Anti-Doping Agency appeal and imposed a ten-month period of ineligibility, effective immediately", said the statement.
In 2012, she stopped working with Luis Garcia del Moral, one of the doctors at the centre of cyclist Lance Armstrong's doping scandal.
Last week, Errani withdrew from the Croatia Bol Open after reaching the semi-final stage.
Errani is also a three-time Fed Cup champion.
According to the World Anti-Doping Agency, letrozole is an aromatase inhibitor that can act as a hormonal and metabolic stimulant by increasing testosterone concentration.
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