AJ Pierzynski, C CWS (9.8%): Looking for a quick fill in for your catcher (that's you, Mike Napoli owners), or a hot second catcher? AJ's been raking lately to the tune of .377/.483/.860 in June. is he going to keep it up? Probably not for much longer, but with how volatile catchers' performances can be, it's good to ride the hot hand if you need it.
Jemile Weeks, 2B OAK (21%): Surprised that his ownership is so low? So am I. Weeks has posted a .867 OPS in his first 14 games at a position that's still full of slow starters (Uggla, Hill), and it's almost July! With Ellis really struggling, Weeks will probably hold the position for the duration of the season. Weeks doesn't quite have the statistical dominance in his minor league career like some other rookies that have been called up recently, so I would be thinking about parlaying him to some teams selling for next year if his success continues over the next month or so.
You can find Lee on Twitter at @fenwayhotspur and the team at @Rotosavants