Alonso (forearm) will undergo season-ending surgery Friday, Corey Brock of MLB.com reports. Things have been trending this way for a while, but a date is now set for Alonso to undergo surgery on his injured forearm. A recovery timetable has been set at 5-to-7 weeks, meaning Alonso should be back at 100 percent well ahead of spring training. Jake Goebbert, Tommy Medica and Yasmani Grandal will likely all factor in at first base over the final month of the season.