Hernández was selected by the
California Angels as the 16th pick in the first round of the 1986 amateur draft. He was traded to the
Chicago White Sox in 1989. In 1991, while pitching for the
Vancouver Canadians of the
Pacific Coast League, Hernández experienced numbness in his pitching hand, later determined to be caused by blood clots. He was rushed into emergency surgery to have veins transplanted from his inner thigh to his forearm. The surgery was successful and he went on to make his major league debut as a
starting pitcher against the
Kansas City Royals on September 2 of that year. Hernández had a long and largely successful career as a
relief pitcher in the major leagues. In 1993, he was instrumental in the White Sox' drive for the
American League West Division
pennant, going 2–1 with 21
saves in the second half of the season. He made four appearances in the
American League Championship Series that year and pitched four scoreless
innings. During the season, the White Sox traded Hernández,
Wilson Álvarez, and
Danny Darwin, to the
San Francisco Giants for six prospects (
Keith Foulke,
Bob Howry,
Lorenzo Barceló,
Mike Caruso,
Ken Vining, and Brian Manning in what became known as the
White Flag Trade. He appeared in all three games of the
National League Division Series against the
Florida Marlins. After the season, he signed as a free agent with the
Tampa Bay Devil Rays. In 1999, he earned his career-high of 43 saves which was a Devil Rays team record until 2010. Despite his 43 saves, the team only won 69 games overall. His performance level declined after being traded to the
Kansas City Royals prior to the season. He went on to sign as a free agent with the
Atlanta Braves in 2003, the
Philadelphia Phillies in 2004, and the
New York Mets in 2005. After 2002, he moved from being a closer to being a setup man, in which role he generally flourished. He signed a one-year contract with the
Pittsburgh Pirates for the 2006 season. On July 31, 2006, Hernández was reacquired by the Mets along with pitcher
Óliver Pérez for outfielder
Xavier Nady. On December 2, 2006, Hernández signed a one-year, $3.5 million contract with the
Cleveland Indians for the season with a $3.7 million club option for 2008. and
waived for the purposes of giving him his unconditional release on June 28. Hernández was signed to a minor league contract by the
Los Angeles Dodgers on July 7, 2007, and, after pitching in one game for the Triple-A
Las Vegas 51s, was recalled to the Dodgers on July 18. On August 16, 2007, Hernández appeared in his 1,000th game against the
Houston Astros. He became the 11th pitcher in major league baseball history to appear in 1,000 career games. In addition to his MLB career, Hernández played in the Puerto Rican Winter League from 1987 to 1996 with the
Mayaguez Indians. ==Personal life==