Researching stats today it looks like 2011 Anthony Vasquez from the Seattle Mariners has the highest rate of HR/9 allowed at 3.99.  Does anybody know of a player higher?  What's astounding is that he pitched in Safeco Field while still allowing this HR rate!  Has anybody ever used him and how did he perform?

Here's his stat line:

29
1
6
0
8.90
1.91
.351
3.99
3.99
3.07
$200,000
B/C