Kei isn't the perfect example indeed, yet he's at least for me much more a shot maker than Ferrer.
I often watch these matches soundless and often miss this, but for some reason i watch and listened to this one and it was really annoying.
I'm actually not spamming the forum with "ban the cheater" kind of threads only because Haas never even seemed to notice it, while he's usually a hot tempered one and if it had annoyed him, he might have asked the umpire for a warning or whatever.
Still in my mind it looked intentional and unfair, despite it wasn't the prime reason for Haas losing.
Anyways, never been a fan of Ferrer, never will be a Landers' level of hater for the guy, but i'm definitely on the antipathy side now.
Not only Haas didn't notice it, it seems you're the only one in this thread too who is talking about it