New York ? Boston Red Sox slugger David Ortiz became the latest star implicated in baseball’s ever-growing drug scandal, acknowledging Thursday that the players’ union confirmed he tested positive in 2003.

Shortly after hitting the go-ahead home run that beat Oakland 8-5, Ortiz responded to a story on The New York Times’ Web site that he and former teammate Manny Ramirez tested positive for performance-enhancing drugs six years ago.

“I’ve just been told that the report is true,” Ortiz said in a statement after contacting the union. “Based on the way I lived my life I’m surprised to learn I tested positive.”

The popular Big Papi, who never had been linked to drugs, said he intended to find out what was in his system and would tell the Red Sox and the public.

“You know me — I will not hide and I will not make excuses,” he said.

Alex Rodriguez, Barry Bonds, Roger Clemens and Sammy Sosa are among the many All-Stars tainted by the cloud of steroids and drugs, which has called into question some of the sport’s greatest achievements over the last two decades.

Ortiz and Ramirez led the Red Sox to the World Series title in 2004 — their first in 86 years — and another championship in 2007.

Ramirez, now with the Los Angeles Dodgers, recently served a 50-game suspension for violating baseball’s drug policy. Asked about this second alleged doping violation, he told reporters in St. Louis: “You want more information, I’m pretty sure you guys got the phone number to the union. Call the union, and they can explain that to you guys.”

“Me and David, we’re like two mountains,” he said. “We’re going to keep playing the game, and we’re going to keep doing good. We’re trying to move forward; that’s the key here.”

Red Sox manager Terry Francona, who guided Boston to those two titles, said the news “blindsided everybody,” including Ortiz.

“Nobody condones the use of performance-enhancing drugs … the testing procedure was confidential. I don’t know how you can go back on that now,” he said.

In 2003, 104 major leaguers tested positive for performance-enhancing drugs; the results were supposed to be anonymous and are now under court seal.

“Precisely for that reason, the Players Association will not, indeed cannot, comment on whether the information is accurate,” union leader Donald Fehr said.

The Times’ story cited lawyers involved in pending litigation over the testing results who spoke anonymously because the information is under seal. The newspaper did not say what the players tested positive for.

“Can somebody in baseball — we’re all begging, people — get that stupid list out and move on,” Chicago White Sox manager Ozzie Guillen said. “This is ridiculous; this is embarrassing; this is a joke. Whoever is there is there, get them out, and that’s it.”

As for Ortiz, “too bad for him, too bad for baseball. Too bad for both,” New York Yankees star Derek Jeter said. “I’m sad for everyone. Once again, we’re sitting here talking about this again.”

There were no penalties for a positive test in 2003 — the anonymous tests were conducted to determine if it was necessary to impose mandatory random drug testing across the major leagues in 2004. But federal agents seized the results as part of the BALCO investigation.