In boxing, the country has produced scores of world-class fighters and several world champions, such as Carlos Cruz, his brother Leo, Juan Guzman, and Joan Guzman. Basketball also enjoys a relatively high level of popularity. Tito Horford, his son Al, Felipe Lopez, and Francisco Garcia are among the Dominican-born players currently or formerly in the National Basketball Association (NBA). Olympic gold medalist and world champion hurdler Félix Sánchez hails from the Dominican Republic, as does NFL defensive end Luis Castillo.