Matt den Dekker was born in Fort Lauderdale, Florida. He has an older brother and a younger sister. The den Dekker family traces its roots back to Indonesia, a former Dutch colony. In 2014, Matt married Christine McNamara in Palm Coast, Florida.
Amateur career
After his freshman year of high school, den Dekker transferred from Coral Springs Christian Academy to Westminster Academy Christian School in Fort Lauderdale, in order to play outfield and pitch alongside his cousin, Westminster's ace pitcher, Kevin Chapman. den Dekker also played with future Washington Nationals teammate Michael A. Taylor at Westminster when the former was a senior and the latter was a freshman. As a junior, den Dekker finished with a.350 batting average and was named to the Miami Herald's All-Broward County First Team. However, the few college recruiters who showed interest were mostly small schools that wanted him to pitch. Den Dekker's only Division I scholarship offer came from a University of Florida recruiter who had attended Westminster's practices and games only to scout Chapman. When Chapman signed on to play college baseball for the Florida Gators, den Dekker quickly followed suit. As a freshman, he batted.234/.324/.418. As a sophomore, den Dekker hit.333/.413/.507 with 20 steals in 20 tries and 55 runs in 55 games. The center fielder was a first-team All-Southeastern Conference selection as an outfielder. Den Dekker was then chosen for Team USA's college edition. He batted.176/.375/.176 in the 2008 Haarlem Baseball Week; noted for his defense, he made one error and noted for his speed, he was thrown out in his lone attempt. Den Dekker batted.227/.292/.409 in the 2008 World University Baseball Championship, and did not attempt a steal. Den Dekker hit.296/.409/.412 as a junior with 17 steals in 18 tries. He was still rated 92nd overall by Baseball America among prospects entering the 2009 Major League Baseball draft – then was not selected until the 475th overall pick, when the Pittsburgh Pirates selected him in the 16th round. He returned to Florida for his senior year, hitting.358 with a team-leading 64 runs scored and a career-best 49 runs batted in as the Gators reached the 2010 College World Series.
Professional career
New York Mets
After college, den Dekker was selected by the New York Mets in the fifth round of the 2010 Major League Baseball draft. He made his pro debut that summer with the Gulf Coast League Mets, hitting.278 with five RBIs in five games before being promoted to the Savannah Sand Gnats. In 2011, den Dekker played for the St. Lucie Mets and Binghamton Mets. He was invited to spring training in 2012. In 2013, den Dekker received his third invitation to the Mets Spring training camp. He played in a career-high 19 games and posted a.205 batting average as he went 9-for-44 with one home run and seven runs batted in while striking out 16 times. On March 24, den Dekker broke his right wrist attempting to make a play on a fly ball hit by Detroit Tigers outfielder Austin Jackson. On August 27, the Mets promoted den Dekker to the major leagues. He made his major league debut on August 29. He hit his first MLB home run on September 1, off Ross Ohlendorf of the Washington Nationals. For the season, he batted.207/.270/.276.
Washington Nationals
On March 30, 2015, the Mets traded den Dekker to the Washington Nationals for pitcher Jerry Blevins. Den Dekker was optioned to the Syracuse Chiefs at the end of Spring Training on April 1, 2016. He was recalled on April 6 when Ben Revere was placed on the disabled list. After the Nationals optioned him back to Syracuse later in the season, den Dekker hit just.208 before being taken off the 40-man roster and outrighted to the minors on September 3, 2016. For the season, he batted.176/.282/.294.
During the 2016 offseason, den Dekker signed a minor league contract with the Miami Marlins. On May 2, 2017, he opted out of his contract, becoming a free agent.
Detroit Tigers
On May 16, 2017, den Dekker signed a minor league deal with the Detroit Tigers. He was called up by the Tigers on June 23. On July 5, 2017, he was designated for assignment and sent outright to the Toledo Mud Hens four days later. For the season, he batted 1-for-7. After the 2017 season, den Dekker elected free agency.
Return to the New York Mets
On February 15, 2018, den Dekker returned to the New York Mets, signing a minor league contract with an invitation to Spring Training. Den Dekker had his contract selected on July 11, 2018. He was designated for assignment on July 27, 2018. On October 2, 2018, he elected to become a free agent.
On March 26, 2019, den Dekker signed with the Long Island Ducks of the independent Atlantic League of Professional Baseball. On June 7, he announced his retirement from professional baseball.
