 On July 29, 2009 the Mariners traded Balentien to the Cincinnati Reds for reliever Robert Manuel.In his final game with the Reds against Pittsburgh Pirates on October 2, Balentien hit the longest home run of that major league season, midway up the upper deck in left field with an estimated distance of 500 feet.On November 16, 2010, Balentien signed with the Tokyo Yakult Swallows in Japan.