After going 4–4 with a 3.98 ERA and a respectable 1.35 WHIP in 14 starts at Harrisburg, he was promoted on June 21 to Triple-A Columbus, where he went 1–2 and accrued a 3.02 ERA in 7 starts, striking out 42 batters and walking 17. He was selected as a member of the World Team for the 2008 All-Star Futures Game in Yankee Stadium. Martis was called up to the major-league roster on September 2, with the intent of assigning him to the bullpen.
Martis had an impressive start to his career, going 4–4 with a 3.98 ERA and 1.35 WHIP in 14 games at Harrisburg. He was then promoted to Columbus, where he went 1–2 with a 3.02 ERA in 7 starts, striking out 42 batters and walking just 17. He was selected for the All-Star Futures Game and eventually called up to the major leagues on September 2, with plans to use him as a reliever.