Martin (hamstring) made his professional debut Monday for the Giants' rookie-level Arizona Complex League affiliate, going 1-for-2 with a strikeout and a run scored.
The No. 52 overall pick in last year's draft, Martin received the equivalent of first-round money (just shy of a $3 million signing bonus) due to his upside, but he didn't face high-caliber competition against Colorado high schoolers, and he's already 20 years old. Given that he's a couple years older than most of the top prospects in the ACL, the expectation should be that he will spend the bulk of this season at Single-A.