I combined PECOTA's rest of season projections available here with the current standings (through yesterday's games) and calculated the end of season records.
The Cubs have the 5th or 6th worse projected record moving forward, but thanks to their current record they're projected to have the top pick in the 2013 draft. It looks like any of 6 teams could make a run for the top spot so every loss counts.
The Yankees, Rangers and White Sox are expected to win their respective divisions in the AL. The Angels and Rays look to fight it out in what should really be called game 163 for entrance into the same playoffs we've had since the divisional era.
In the NL, the Nationals, Giants and Reds become the least impressive group of division winners that I can recall as none of them have the type of record you'd expect from a division winner. Maybe in one division, but all 3? The Braves earn the right to play in game 163 while the Cardinals and Dodgers will play rock, paper, scissors to see who gets to play the Braves.