Barry William Zito (born May 13, 1978) is an American professional baseball pitcher in Major League Baseball who is a free agent as of 2014. He stands 6 feet 2 inches (1.88 m) tall and weighs 205 pounds (93 kg). He played for the Oakland Athletics and San Francisco Giants . He bats and throws left-handed . His pitching repertoire consists of a curveball (his strikeout pitch), a four-seam fastball, a two-seam fastball, a circle changeup, and a cutter - slider .