Belgian tennis players Yanina Wickmayer and Xavier Malisse have appealed to Switzerland's Supreme Court to end a two-year investigation into whether they broke anti-doping rules.
The Court of Arbitration for Sport says the players have asked the Swiss Federal Tribunal to rule that CAS has no authority to judge them.
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CAS says its scheduled Sept. 12 hearing involving Wickmayer, Malisse and the World Anti-Doping Agency has therefore been suspended.
Wickmayer, currently ranked No. 21, and 54th-ranked Malisse got one-year bans in 2009 after a Belgian doping tribunal ruled they failed to give details of their whereabouts for drug testing.
They returned to play after a different Belgian court granted injunctions against the bans.
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