I'm not alone in this line of thinking, and I'm certainly not saying this without a lot to back it up. I'm not just trying to piss off Orioles fans, because I rather like them.
This will come down to pitching, and neither the A's nor the Orioles have a single pitcher with 170-200 innings pitched in a single season (save for oft-injured Brandon McCarthy who did it only last year and has spent 2-months on the DL this year and Bartolo Colon who hasn't done it in 7 years). The longer the season goes, the more these tired arms are going to start showing kinks in the armor. Only a foolish man would bet against (LAA) Weaver, Wilson, Haren, Grienke or (TB) Price, Shields, Hellickson and Moore or (ChiW) Sale, Floyd, Liriano, Peavy or (Det) Verlander, Fister, Scherzer, Porcello. The AL Wild Card Race is deep with strong arms....the question is who's the odd man out between the White Sox, Tigers, Angels or Rays? My hope is that the Central teams beat each other up and only one makes it.
I'm sorry, but I just don't see how Oakland's staff or Baltimore's staff has the horses to go the last 45 games. Especially the Orioles - they're the only team in baseball with a +.500 record and a negative run differential, and it's not even close at -43. That stuff catches up to you eventually.
The NL race is a little different. The Pirates actually do have some arms with experience in Burnett, Coreia, Bedard and Rodriguez. Even Karstens and Macdonald have thrown 170 innings in a season. They just might not have the offense to contend with Atlanta or St Louis. The Giants pitching staff is coming around and Dodgers all of a sudden have some depth. I would love to see the Pirates break the drought, but I think Lincecum will save the Giants and the Cardinals and Braves battle it out for the second spot.
But hey, I've been wrong once. Ask hutch.