The eighth overall pick in the 2007 draft will miss the entire 2009 season.

Rockies righthander Casey Weathers will likely undergo Tommy John surgery after getting a second medical opinion, according to Baseball America columnist Tracy Ringolsby.

Weathers, 23, worked in the mid- to high-90s with his fastball and mixed in a high-80s slider this season for Double-A Tulsa, though he often struggled with his command. After posting a 3.05 ERA with 28 walks and 54 strikeouts in 44 1/3 innings out of the Drillers’ bullpen, Weathers joined the U.S. Olympic team in Beijing. Weathers had been pitching in the Arizona Fall League as well.