Martinez was optioned to Triple-A Las Vegas following last week's start in Detroit.
Oddly enough, his best statistical start of the season was his one for the big club, as he struck out three over 5.1 scoreless innings. It's been a different story in the hitter-friendly Pacific Coast League, where he has a 7.61 ERA, 1.52 WHIP and 32 strikeouts in 23.2 innings through six starts.