It's a bad call, but the worst? Hell no. The worst ever was Mariana Alves calling a Serena shot out in the second set of a match against Jennifer Capriati that was inside both lines by like a foot. I don't particularly like Serena as a player, and I think some of the stuff she did later was pretty bad, but I can understand how she got a complex at the U.S. Open because of this incident.
It wasn't the only bad call in that match either, as this video shows, but the really bad one is about 25 seconds in:
It wasn't the only bad call in that match either, as this video shows, but the really bad one is about 25 seconds in:
