Really?? I thought double bagels were a lot more common than that
I guess they mostly just happen to me when I play
Average about one every 10 months or so longer term. Plenty in qualis, but that's because they let futures players in there, and occasionally a local taxi driver or 2.
On the wtw it happens all the time though :-) Even in a final (Quebec 2006, bartoli vs puchkova), and three semis in the last decade.