Baseball player Alex "A-Rod" Rodriguez admitted this week that he used performance-enhancing steroids, but doesn’t know "what substances he used." While the scandal-scarred celebrity claims to be hazy on the details of his drug use, he does claim to know one thing for sure: He has no respect for Selena Roberts, the Sports Illustrated reporter who blew the lid on his secret.

Alex Rodriguez claimed last night that Roberts, who co-wrote with David Epstein the bombshell piece on A-Rod’s steroid use, is "stalking" him.

"What makes me upset is that Sports Illustrated pays this lady, Selena Roberts, to stalk me," Rodriguez told ESPN’s Peter Gammons on Monday night in an interview in his Miami home.

A-Rod continued:

This lady has been thrown out of my apartment in New York City. This lady has five days ago just been thrown out of the University of Miami police for trespassing. And four days ago she tried to break into my house where my girls are up there sleeping, and got cited by the Miami Beach police. I have the paper here. This lady is coming out with all these allegations, all these lies because she’s writing an article for Sports Illustrated and she’s coming out with a book in May. Really respectable journalists are following this lady off the cliff and following her lead. And that, to me, is unfortunate.

Roberts, meanwhile, denies the allegations and insisted, "The allegations made by Alex Rodriguez are absurd. I’ve never set foot in the lobby of Alex’s New York apartment building, never spoken to the University of Miami police and never got on his home property or been cited by the Miami Police for doing so."

Also during the interview, the Yankee slugger reflected the repercussions of his actions. "I have millions of fans out there that, you know, will never look at me the same," he said. President Barack Obama shared similar sentiments at his news conference last night. When asked what he thought about A-Rod’s confessed steroid use, Obama called it "depressing news" that "tarnished an entire era" of Major League Baseball. He said:

You know, I think it’s depressing news on top of what’s been a flurry of depressing items when it comes to Major League Baseball. And if you’re a fan of Major League Baseball, I think it — it tarnishes an entire era, to some degree. And it’s unfortunate, because I think there are a lot of ballplayers who played it straight.

And, you know, the thing I’m probably most concerned about is the message it sends to our kids. What I’m pleased about is Major League Baseball seems to finally be taking this seriously, to recognize how big a problem this is for the sport, and that our kids hopefully are watching and saying, "You know what? There are no short cuts, that when you try to take short cuts, you may end up tarnishing your entire career, and that your integrity’s not worth it." That’s the message I hope is communicated.

Rodriguez’s mea culpa to Gammons came two days after SI.com revealed that four sources confirmed that while he played for the Texas Rangers in 2003, A-Rod tested positive for two anabolic steroids — testosterone and Primobolan.

Click here for a complete transcript and video from Rodriguez’s interview with ESPN reporter Peter Gammons.