In high school, he was a pitcher for First Presbyterian Day School in Macon, Georgia. He threw three no-hitters during his high-school career. He was soon drafted by the Atlanta Braves in the 18th round (516th overall) of the 1993 Major League Baseball Draft.

In 1998, he was promoted to the major league club. In Rocker's first season in the Major Leagues, he was 1–3 with a 2.13 ERA in 38 innings pitched. The following year, an injury put Atlanta closer Kerry Ligtenberg on the DL, moving Rocker into the role of closer, where he was 4–5 with 38 saves and a 2.49 ERA. In 2000, he was 1–2 with 24 saves, posting a 2.89 ERA, but in June 2000, Rocker was demoted for threatening a reporter.

Braves fans were initially willing to support him; however, as Rocker received intense taunting from opposing teams' fans, his pitching performance declined. On June 23, 2001, Rocker, along with minor-league infielder Troy Cameron (Atlanta's first-round draft pick in 1997), was traded to the Cleveland Indians for right-handed relievers Steve Karsay and Steve Reed, along with cash. In Cleveland, his record that year was 3–7 with a 5.45 ERA and four saves. Rocker also played that year for the Indians in the ALDS against the Seattle Mariners. The following year, the Indians traded him to the Texas Rangers for pitcher David Elder. In Texas, he refused designation to the minor leagues. In 2002, he again struggled at 2–3 with a 6.66 ERA and was released. In 2003, Rocker signed with the Tampa Bay Devil Rays but was released after two appearances and an ERA of 9.00.

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