"I spent many, many hours thinking about it," Selig told reporters Thursday at the owners' meetings in Cooperstown, N.Y. "Trying to be fair, trying to be logical and rational. And the one thing you learn in this job after 20-something years, I wouldn't second-guess it today at all.
"I know why I did it, and what I did. I thought it was eminently fair then and I think it's eminently fair today."
Rodriguez is appealing the suspension, which he received Aug. 5 for violating baseball's drug policy because of his involvement in the Biogenesis case.
Rodriguez did not appear in the clubhouse Thursday after the Yankees' 8-4 loss to the Los Angeles Angels.
Some believe Rodriguez received too harsh a penalty. Others believe MLB might be out to get the three-time American League MVP.
"I can't control what other people say and do," Selig said. "I have a job to do, and the job is to protect the integrity of the sport and enforce our program, and that's what I'm going to do.
"It's no more involved than that, and that's exactly what it is."
Mike Mazzeo is a regular contributor to ESPNNewYork.com.