Fernando Gabriel Tatís Sr. (born January 1, 1975) is a Dominican former professional baseball third baseman, and a current manager in Minor League Baseball. Over his 11-year Major League Baseball (MLB) career, he played for the Texas Rangers, St. Louis Cardinals, Montreal Expos, Baltimore Orioles, and the New York Mets. Tatis holds the major league record for RBIs in an inning, a feat that he achieved by hitting two grand slam home runs in one inning during a game on April 23, 1999, becoming the only player in MLB history ever to do so.
Tatis with the New York Mets
|Born: January 1, 1975|
San Pedro de Macorís, Dominican Republic
|July 26, 1997, for the Texas Rangers|
|Last MLB appearance|
|July 4, 2010, for the New York Mets|
|Runs batted in||448|
|Career highlights and awards|
At the age of 17, Tatís was signed as an amateur free agent by Omar Minaya and the Texas Rangers on August 25, 1992. He played his first game in Major League Baseball with the Rangers, at third base, almost five years later on July 26, 1997, and went on to play 60 games with the Rangers in his rookie season. At the trade deadline on July 31, 1998, the Rangers traded Tatís along with Darren Oliver and Mark Little to the St. Louis Cardinals for Royce Clayton and Todd Stottlemyre.
Tatís had the best season of his career in 1999 with the St. Louis Cardinals. He hit 34 home runs with 107 RBIs and 21 stolen bases, with a .298 batting average. On April 23, 1999, Tatís made baseball history when he hit two grand slams in one inning. He is the only batter in MLB history to accomplish this feat. Tatís hit both of his grand slams against the pitcher Chan Ho Park of the Los Angeles Dodgers. With these home runs Tatís also set a Major League record with eight runs batted in during a single inning.
After playing in only 96 games for the Cardinals in 2000 because of an injury, Tatís was traded to the Montreal Expos along with Britt Reames for Dustin Hermanson and Steve Kline. Tatís played in just 208 games out of a possible 486 over three seasons with the Expos because of an assortment of physical injuries.
The Tampa Bay Devil Rays invited Tatís to spring training in 2004, but he did not make the team and was released. Tatís next did not play professional baseball for two seasons and resided in the Dominican Republic.
The Baltimore Orioles signed Tatís to a minor-league contract on November 25, 2005. Tatís returned to baseball in order to raise money to build a church. He played most of the season for the AAA baseball, the Ottawa Lynx, eventually playing in 28 games for the Orioles after being called up on July 21, 2006.
In 2007, Tatís was invited to spring training with the Los Angeles Dodgers. After being assigned to minor-league baseball camp, Tatís was granted his request to be released from his contract on March 14. Just nine days later, he signed a minor-league contract with the New York Mets, and spent the 2007 season with its AAA affiliate, the New Orleans Zephyrs.
On May 28, Tatís hit a walk-off double against Justin Miller to defeat the Florida Marlins in the bottom of the 12th inning. This was Tatís's first career walk-off hit. Tatís played most of his time with the Mets in left field and right field because of injuries to the usual starters Moisés Alou and Ryan Church.
On September 16, 2008, Tatís separated his shoulder after diving for a fly ball in a game against the Washington Nationals. The Mets team physician diagnosed the injury as being a Grade III separation, but Tatís missed the rest of the 2008 regular season. Despite missing the end of the season, on October 23, 2008, Tatís received the Sporting News Comeback Player of the Year Award for the National League.
Tatís played intermittently for the Mets in 2009 and 2010. His last Major League game was on July 4, 2010. He was also the latest New York Met to wear uniform number 17, which was then taken out of circulation for Keith Hernandez due to public outcry.
On October 5, 2014, Tatís announced his retirement as a player. For his career, he batted .265 with 113 home runs and 448 RBIs.
Tatís' father, Fernando Aanonio Tatís, was also a professional baseball player. He was an infielder in the Houston Astros system from 1969 through 1978, reaching as high as Class AAA before retiring and moving on to coaching and scouting Houston's minor leaguers. The elder Tatís disappeared from Fernando's life when he was four years old. The two were not reunited until 1997 when the younger Tatís was a rookie with the Texas Rangers. Rangers scout Omar Minaya, who Tatís described as a father figure, related the story of Tatis' search for his father to New York Times national baseball writer Murray Chass. Chass wrote about the search  and that article led to the reunion of Tatis and his father. 
- "St. Louis Cardinals 12, Los Angeles Dodgers 5". Retrosheet. April 23, 1999. Retrieved January 12, 2019.
- "Two grand slams in a game". MLB.com. Retrieved January 12, 2019.
- "RBI Records / Runs Batted in Records". Baseball Almanac. Retrieved January 12, 2019.
- DiComo, Anthony (July 28, 2008). "For want of a church, Tatis reborn". MLB.com. Retrieved August 13, 2008.
- "Orioles purchase contract of 3B Tatis from minors". SportsTicker. July 21, 2006. Retrieved August 13, 2008.
- Hubbuch, Bart (May 11, 2008). "Santana gets OK to start vs. Yankees". New York Post. Retrieved August 13, 2008.
- "Marlins homer to take lead, but Tatis' double lifts Mets in 12th". Associated Press. May 28, 2008. Retrieved August 13, 2008.
- "Red Sox announce minor league field staffs for 2018". MLB.com. January 9, 2018. Retrieved January 10, 2018.
- Chass, Murray (August 18, 1997). "`Rangers' Tatis Searches for a Father He Barely Knew". The New York Times. Retrieved July 7, 2019.
- Chass, Murray (August 20, 1997). "`Tatis Finally Hears, 'We Found Your Father'". The New York Times. Retrieved July 7, 2019.
- "Tatis Jr. among White Sox finds on int'l market". MLB.com. Retrieved July 2, 2015.
- Simon, Andrew (April 23, 2019). "Two grand slams in one inning? Won't happen again". MLB.com. Retrieved April 23, 2019.