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|Born: June 29, 1969|
San Juan, Puerto Rico
|April 27, 1995, for the Texas Rangers|
|Last MLB appearance|
|August 5, 1997, for the Texas Rangers|
|Earned run average||7.41|
On June 11, 1991 Alberro signed with the Texas Rangers as an amateur free agent. In 1991 he split time with the Rookie-league Gulf Coast League Rangers and the Advanced-A Charlotte Rangers. He went a combined 2–1 with a 2.75 ERA in 24 games, all in relief.
Alberro was promoted to the Double-A Tulsa Drillers in 1993 where in 17 games he compiled no decisions with a 0.95 ERA and five saves. His outstanding play soon saw him a promotion to the Triple-A Oklahoma City 89ers where in 12 games he did not involve in a decision, though his ERA did balloon to a combined 3.75.
In 1994 he spent the entire season with the 89ers compiling a record of 4–3 with a 4.52 ERA and 11 saves in 52 games.
Alberro began the 1995 season with the 89ers but was soon called up to the major league club on April 27. With the Rangers he involved in no decisions in 12 games, 20 2⁄3 innings pitched, and a 7.40 ERA. That same year with the 89ers he went 4–2 with a 3.36 ERA in 20 games, 10 for starts.
Most of Alberro's 1996 season was spent with the 89ers, though he did have a short stint with the Rangers. In 29 games, 27 for starts, Alberro compiled a 9–9 record with a 3.47 ERA with the Triple-A club. At the Major League level he went 0–1 with a 5.79 ERA in five games, one start.
In 1997 Alberro spent the first half of the season with the 89ers going 5–6 with a 4.22 ERA in 16 games, all for starts. His play at the Triple-A level received him a promotion to the Majors, going 0–3 with a 7.94 ERA in 10 games, four for starts. His last game was August 5, 1997.
New York Yankees
After his last game with the Rangers they attempted to assign Alberro to the minors. He refused the assignment and on August 11, 1997, he was claimed on waivers by the New York Yankees. Alberro never played at the Major League level after he was waived. He spent the '97 season with the Triple-A Columbus Clippers of the International League. In one game with the Clippers he registered a loss, giving up five hits, four runs (three earned), in eight innings pitched.
Alberro returned for the Yankees in 1998, pitching for the Clippers. He went 8–10 with a 4.52 ERA in 46 games, 13 for starts.
Alberro began the 1999 season in the Detroit Tigers' Minor League system, splitting time with both the Double-A Jacksonville Suns and the Triple-A Toledo Mud Hens. With Toledo, the team in which he spent most of his time, he compiled a 2–2 record with a 5.25 ERA in 14 games.
In 1999 Alberro spent most of his time with the Triple-A Calgary Cannons. He was 3–2 with a 6.64 ERA in 24 games, eight for starts. The Marlins would become the last Major League organization Alberro would play for.
Alberro signed with the Aberdeen Arsenal of the independent Atlantic League in 2000. He found some success coming out of the bullpen for the Arsenal going 3–6 with a 4.62 ERA in 49 games, pitching 60 1⁄3 innings.
In 2001 he split time with the Atlantic City Surf and the Newark Bears. He pitched well for Atlantic City, in 12 games he was involved in no decisions and compiled a 1.93 ERA. For the Bears he was less than perfect going 3–2 with a dismal 9.42 ERA in 13 games, one start.