First baseman Adam LaRoche and the Arizona Diamondbacks finalized a one-year contract on Friday that guarantees him $6 million. LaRoche gets $4.5 million this year, and the deal includes a $7.5 million mutual option for 2011 with a $1.5 million buyout. LaRoche receives the buyout if either side declines, and if he gets traded the option price would increase to $9.5 million.