Former Twins manager Ron Gardenhire has been diagnosed with prostate cancer. Gardenhire announced today that he will undergo surgery in Minnesota sometime within the next few weeks. The 59-year-old managed the Twins for 13 seasons and owns the second-most victories in franchise history. Gardenhire was hired last November to serve as bench coach for the Arizona Diamondbacks. Gardenhire says he was diagnosed earlier this month after feeling ill as he prepared for spring training in Scottsdale, Arizona.