Belgian duo Yanina Wickmayer and Xavier Malisse have appealed to the Court of Arbitration for Sport against one-year bans for breaching anti-doping rules.
US Open semi-finalist Wickmayer received the suspension earlier this month from a Flemish anti-doping tribunal after failing three times to report her whereabouts for drug testing.
Malisse twice failed to report his whereabouts and also missed a test when he was unavailable for testing at an address he had provided.
A decision from CAS will be made within four months.
