Eisler Liván Hernández Carrera (Spanish pronunciation: ; born February 20, 1975) is a Cuban professional baseball pitcher for the Washington Nationals of Major League Baseball. He is the half-brother of pitcher Orlando "El Duque" Hernández.
Hernández was a successful baseball player from a poor family in Cuba. He was born in Villa Clara Province. After meeting recruiter Joe Cubas in Venezuela in 1994, the two planned an escape through Mexico. At the age of 20, Hernández gave up his $6/month job as an official Cuban athlete and defected to the United States in 1995. His half-brother, Orlando, would defect two years later.
He has also played for the San Francisco Giants (2000–2004), the Montreal Expos (2003–2004), the Washington Nationals (2005–2006), the Arizona Diamondbacks (2006–2007), the Minnesota Twins, the Colorado Rockies (2008), and the New York Mets (2009). He bats and throws right-handed, and is known for often throwing a "slow hook," sometimes going even below 60 miles per hour, as a strikeout pitch.