What is the record for DF in a match

Currently Elena-Ai are 15-16 in DF and it's the begining of the 3rd set...

Is there any record of DF in WTA match?

I think you've never heard of the scary number of DF hit by Kournikova? I forget the exact number but it's around 32-34... against a japanese player I think.

Kournikova at AO ... first Saeki and then Farina ... all together over 50 DF!

didn't Anna hit about 20 odd at Hong Kong event in 2002 or was it 2001

In 2006 ASB Classic, Jelena Dokic hit 28 double faults in her first round loss to Julia Schruff (5-7, 7-6(3), 6-1).

May not be a record, but quite impressive. ;)