American to sue WTA and ITF

Brengle, who has won more than $2.1m ( 1.5m) in prize money, said: “I am bringing this action in an effort to force those who control the sport I love to understand that players are not commodities and should be treated with respect and dignity.

An ITF spokesperson told BBC Sport: “We are aware of Ms Brengle’s statement that she has filed a lawsuit in the USA relating to her alleged treatment in connection with drug-testing under the Tennis Anti-Doping Programme.