Oswaldo Antonio Mairena is a former Major League Baseball

Major League Baseball

Major League Baseball is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League...

 relief pitcher

Relief pitcher

A relief pitcher or reliever is a baseball or softball pitcher who enters the game after the starting pitcher is removed due to injury, ineffectiveness, fatigue, ejection, or for other strategic reasons, such as being substituted by a pinch hitter...

 for the Chicago Cubs

Chicago Cubs

The Chicago Cubs are a professional baseball team located in Chicago, Illinois. They are members of the Central Division of Major League Baseball's National League. They are one of two Major League clubs based in Chicago . The Cubs are also one of the two remaining charter members of the National...

 and Florida Marlins

Florida Marlins

The Miami Marlins are a professional baseball team based in Miami, Florida, United States. Established in 1993 as an expansion franchise called the Florida Marlins, the Marlins are a member of the Eastern Division of Major League Baseball's National League. The Marlins played their home games at...

.

Mairena was signed by the New York Yankees

New York Yankees

The New York Yankees are a professional baseball team based in the The Bronx, New York. They compete in Major League Baseball in the American League's East Division...

 as an amateur free agent

Free agent

In professional sports, a free agent is a player whose contract with a team has expired and who is thus eligible to sign with another club or franchise....

 in . He pitched in the Yankees organization until July 21, , when he was traded with Ben Ford to the Chicago Cubs for Glenallen Hill

Glenallen Hill

Glenallen Hill is a former outfielder in Major League Baseball who played for 13 seasons. Hill played with the Toronto Blue Jays , Cleveland Indians , Chicago Cubs San Francisco Giants , Seattle Mariners , New York Yankees , and Anaheim Angels...

. Mairena made his major league debut for the Cubs on September 5, , but was traded during spring training

Spring training

In Major League Baseball, spring training is a series of practices and exhibition games preceding the start of the regular season. Spring training allows new players to try out for roster and position spots, and gives existing team players practice time prior to competitive play...

 , to the Florida Marlins for Manny Aybar

Manny Aybar

Manuel Antonio Aybar is a retired pitcher who has played in Major League Baseball and Korean Baseball Organization. He bats and throws right-handed....

. In , he pitched in 31 games for the Marlins and had an ERA

Earned run average

In baseball statistics, earned run average is the mean of earned runs given up by a pitcher per nine innings pitched. It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine...

 of 5.35. He spent all of with Triple-A Albuquerque

Albuquerque Isotopes

The Albuquerque Isotopes are a minor league baseball team based in Albuquerque, New Mexico. The team, which plays in the Pacific Coast League, is the Triple-A affiliate of the Los Angeles Dodgers...

. He finished his career in the Mexican League, pitching there in 2004-05.

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