The New York Mets signed Luis Rosado as an amateur free agent in 1972. The native Puerto Rican was initially assigned to the Mets Rookie League team, the Marion Mets. He worked his way through the Met system eventually making his way to their Triple A affiliate, the Tidewater Tides. Along the way, he produced solid but unspectacular numbers primarily as a catcher while playing some first base. After six seasons in the minors Rosado finally got the call to big leagues as a September call up in 1977.
He made his Major League debut on September 8, 1977 as the Mets starting first baseman. He went 0-4 as the Mets lost to the Philadelphia Phillies 8-2. A few days later he got his first major league hit, a single off future Hall of Famer, Steve Carlton and would later score the only run of the game. Rosado would appear in nine games for the Mets in 1977, he hit .208 while driving in three runs.
Rosado returned to the Tidewater Tides in 1978 spending the next three years there before getting one more shot with the Mets in 1980. He appeared in two games for the Mets in the final week of the season going hitless in four at bats.
1980 would be Rosado’s last season in the Mets organization. He would spend a few years in the Mexican League before playing a couple of seasons in the Baltimore Orioles and Detroit Tigers organization. He retired from playing following the 1985 season.
His final numbers in 11 games with the New York Mets were a .179 average with 3 RBIs.
While with the Mets Rosado wore number 35 in 1977 and 58 in 1980.