Lexington, KY ? Roger Clemens stood on the mound in a nearly empty minor-league stadium Thursday night and warned to his son in the batting cage, “time for the heater – fastballs.”

On the first workout fastball, Koby Clemens – third baseman for the Houston Astros’ Class A Lexington Legends – grounded weakly to second. Three heaters later, he launched the ball off a scoreboard on the left-field wall.

Pitching great Roger Clemens adjust his Houston Astros ballcap after re-signing with the baseball team Wednesday, May 31, 2006 in Houston. Roger Clemens is coming out of retirement for the third time, agreeing to a 2 million contract to pitch for the Houston Astros for the rest of 2006.

Dad didn’t even look back.

The future Hall of Famer said his workout went “like clockwork,” although he insisted that wasn’t his prime objective.

“Even with everything going on in my life right now, my job is to turn him loose with his ballclub and his manager, ready to play,” Clemens said after a workout that approached two hours.

Tuesday, Clemens will make his first step in a much-anticipated return to the Astros when he starts for the Legends.