Righthander Justin Duchscherer has reached preliminary agreement on a one-year contract that would keep him with the Athletics, a person with knowledge of the negotiations said yesterday. Duchscherer’s deal is pending a physical, so an announcement by the team might not come for a few days. A two-time All-Star, the 32-year-old missed all of the 2009 season because of an elbow injury and treatment for clinical depression . . . Reliever Matt Capps reached preliminary agreement on a $3.5 million, one-year contract with the Nationals. Capps can earn an additional $425,000 in performance bonuses for games finished, according to his agent, Paul Kinzer, who added that the agreement is subject to a physical that will take place the first week of January . . . Chan Ho Park has sued former Dodgers batterymate Chad Kreuter, accusing the former catcher of not paying off a $460,000 loan. Park filed the lawsuit Wednesday in Los Angeles Superior Court, claiming breach of promissory note and negligent misrepresentation. The suit claims Park loaned Kreuter $460,000 in October 2005 to be repaid a year later with interest. Park alleges that Kreuter paid back $290,000 in April 2007 and the unpaid balance has grown, with interest, to $281,869.73 as of Dec. 1.