Over the next few years, however, Martinez developed the reputation of being an offensive liability. He never appeared in more than 95 games during his time with Kansas City, through 1977. Martinez was traded twice over the next few years, including to the Milwaukee Brewers in late 1977. In the midst of an 18–8 loss to Kansas City on Wednesday, August 29, 1979, Martinez entered the game as the Brewers' sixth pitcher of the day. As a pitcher, Martinez batted in the 9th inning, stroking an RBI single. For Martinez, who played in over 1,000 ML games, this game was his lone appearance in the majors as a pitcher.