Depending how the A's and Yankems fare over their next 4 games, the 3 game SOX/Yankem series could still determine which wild card achieves the HFA. If that's the case, it will be interesting to see how the SOX will put together their line-up and pitching against the Yankems.
Here's a little poll: please choose who you would prefer to play in the opening round? And yes, because of the big differences in the ballparks, I believe HFA will make a significant difference. I would prefer the SOX go against the A's.