 He was assigned to their minor league complex, spending six years in the minors (1998–2003) before joining the big club in late September 2003.He posted a 0–3 record with a 9.92 ERA in four starts for Milwaukee, allowing 18 runs on 25 hits, while striking out 10 and walking 15 in 16.1 innings of work.Following his majors stint, Martínez played in the St. Louis Cardinals and Colorado Rockies minor league systems in 2004.