is that for some odd reason when Qualifiers are favored in their matches,they do pretty piss poor.yes of course thats why they have to go through the qualies,but alot of times it seems that they are pitted vs Wild cards from home countrys of the tourneys or unseeded players who have just enough ATP points to make the main draw.
just a small sample size so far.but so far this year the record of QF's when they are favored in main draw matches is 13-15..
I did a quick(errors possible)1 unit stake if you bet the +dog ever time vs a fav QF and you would be +6.5 units..
NOTE:have no friggin clue about testing this for the WTA..wonder if it would even be worth it.