Joe Mauer (concussion) is not close to returning to the lineup. Mauer is working out at Target Field, but he reports that his concussion symptoms return when his heart rate spikes. The veteran catcher desperately wants to return this season, but the Twins are in no hurry to rush him back. At this point -- with a potential to move up in the draft order and receive more money for picks and international free agents -- Minnesota should probably just pull the plug on Mauer's season. After living through the Justin Morneau experience, the Twins may be inclined to do so even if they have no interest in decreasing their odds of winning in September.