Originally signed by the
Tampa Bay Devil Rays as a free agent in 1996, DeCaster was selected by the
Pittsburgh Pirates from Tampa Bay in the
minor league phase of the
2000 Rule 5 draft. He spent the entire 2005 season with
Triple-A Indianapolis Indians, where he hit .280 with 11
home runs and 61
runs batted in, and also led his club in games played (122) and
doubles (31). He primarily played in the outfield, but also played first, second, and third base. He had a productive 2005–2006 winter league season playing for the
Caribes de Anzoátegui of the
Venezuelan Winter League, where he batted .325 with 17 home runs and 47 RBI in 60 games. His 17 home runs tied him with
Tom Evans for the league lead. In 2006, DeCaster returned to Indianapolis, where he spent most of the season. In 119 games with the Indians, he batted .273 with 11 home runs and 51 RBI. He was called up to the Pirates twice, from May 21–24 and June 5–13, and appeared in three games. He struck out in both of his major league at-bats. He pinch hit twice and pinch ran once for the Pirates, thus never playing defense in the major leagues. He was released on December 7, 2006 On November 27, 2007, DeCaster signed a minor league contract with the
Washington Nationals with an invitation to
spring training. He was assigned to the
Double-A Harrisburg Senators to begin the season, but was promoted to the
Triple-A Columbus Clippers in April 19. He hit a combined .262 with 14 home runs and 104 strikeouts in 104 games in the Nationals' system. He again became a free agent at the end of the season. In December 2008, DeCaster signed a minor league contract with the
Detroit Tigers but was released on April 1, 2009. He began the 2009 season with the
Fargo-Moorhead RedHawks of the independent
Northern League. On June 29, DeCaster's contract was purchased by the
New York Yankees, who assigned him to the
Triple-A Scranton/Wilkes-Barre Yankees. He was released on September 2. He played with the
Reynosa Broncos of the
Mexican League in 2010 and 2011, batting .339 in 101 games in his Mexican debut. He spent most of 2012 with the independent
Winnipeg Goldeyes of the
American Association, playing for one week in June with the
Olmecas de Tabasco in the Mexican League. His team won the American Association championship, as the Goldeyes swept the Fargo-Moorhead RedHawks in the first round, 3 games to 0, and did the same with the
Wichita Wingnuts in the championship, 3 games to 0. In the 2012-13 winter league season, he played
Tigres de Chinandega in
Nicaragua and won the
Triple Crown, hitting .417 with 13 home runs and 56
RBI. DeCaster started 2013 with the
Acereros de Monclova in Mexico before returning to Winnipeg in August. He hit for a combined .315 average in 94 games for both teams, including 13 homers, 64 RBI, and a .461
slugging percentage. He briefly played for
Pirates de Campeche in the Mexican League in 2015. He hit .226 with 2 home runs in 14 games in June and July. ==International career==