6:34pm: MLB.com's Joe Frisaro says that Mientkiewicz opted out of his contract.
6:17pm: The Marlins have released first baseman Doug Mientkiewicz, reports Juan C. Rodriguez of The Sun Sentinel. They signed him to a minor league contract just nine days ago.
The 35-year-old Mientkiewicz appeared in just four games with Florida's Triple-A affiliate, going 4-for-16 with a double and a pair of walks. The Dodgers released the former gold medal winner back in April. Mientkiewicz has hit .281/.376/.380 in 354 big league plate appearances over the last two years, but most of his value stems from his stellar glove work at first base.
