Born in Ciudad Obregón, Mexico, García signed as an amateur free agent with the Los Angeles Dodgers in 1992 at just sixteen years old. After batting .319 with twenty home runs and 91 runs batted in for the Albuquerque Dukes in 1995, he became the youngest player in Major League Baseball when he debuted with the Dodgers that September. He also received major league calls in 1996 and 1997, but spent most of tenure with the Dodgers as a minor leaguer. In five seasons in their farm system, he compiled a .281 batting average, 98 home runs, and 375 RBIs. His first career home run came off of Osvaldo Fernández at Candlestick Park in 1997.

On November 18, 1997, the Arizona Diamondbacks selected García as the ninth overall pick in the 1997 Major League Baseball expansion draft. He earned a spot on the D-Backs’ inaugural season opening day line-up as the starting right-fielder. Garcia hit the second home run in franchise history in the ninth inning of their 9-2 loss to the Colorado Rockies.

On May 28, 1999, Garcia became the 34th player in the history of Major League Baseball to hit a home run over the Tiger Stadium roof in right field, however, he lasted just one full season in Detroit. In June 2000, he was sent to the Baltimore Orioles as part of a conditional deal, but was released by Baltimore after one season with the Triple-A Rochester Red Wings.

García’s 2002 performance earned him a job as Cleveland’s 2003 opening day right fielder, however, a .194 batting average and sloppy play in the outfield caused him to lose his starting job to Jody Gerut by the beginning of May. Shortly afterwards, his contract was purchased by the Yankees.

He is likely best remembered for two incidents in the 2003 American League Championship Series at Fenway Park against the rival Boston Red Sox. Following a Hideki Matsui double that gave the Yankees a 4-2 lead in game three, García was plunked with a Pedro Martínez pitch thrown behind his head. A verbal altercation with Martínez caused benches to empty, and interrupted play. Shortly afterwards, Martínez famously told Peter Gammons during an interview on ESPN:

In 2004, García moved cross-town to the New York Mets. His brief tenure with the Mets included him and teammate Shane Spencer involved in a physical altercation with a pizza deliveryman in a parking lot, but no charges were filed. In July, the Mets traded him to the Baltimore Orioles for relief pitcher Mike DeJean. The Orioles released him in August 2004 with a .212 batting average.

On January 8, 2007, García signed a minor league deal with the Philadelphia Phillies. However, he was released during Spring Training. He ended up joining the Sultanes de Monterrey of the Mexican League for the 2007 season, and batted .374 with 20 home runs to lead his team to a national championship.

In 2011, he returned to the Sultanes de Monterrey in Mexico for a second season with the team. In June 2011, García came back again in South Korea to sign Hanwha Eagles of the KBO. He played for the Eagles until the end of the season.

Later in the same game, García jumped into the bullpen to assist Yankees teammate Jeff Nelson in a fight with a groundskeeper. Martinez later referenced his famous quote during the Fenway Park centennial ceremonies, speaking on the microphone to fans before a game against the Yankees in 2012.

In 2012, he played for the Sultanes de Monterrey of the Mexican Summer League and the Naranjeros de Hermosillo of the Mexican Pacific League.