updated 8:45 p.m. ET March 16, 2006

ANAHEIM, Calif. - Team USA still has a chance to win the World Baseball Classic thanks to South Korea.

Now, it’s up to Roger Clemens and his teammates to take advantage of the opportunity.

Chan Ho Park and four relievers combined to pitch a six-hitter, Jong Beom Lee hit a two-run double in the eighth, and South Korea beat Japan 2-1 Wednesday night to clinch a berth in the semifinals of the inaugural WBC.

The Americans, who would have been eliminated with a low-scoring win by Japan, can wrap up the other semifinal berth in Group One on Thursday with Clemens on the mound by beating Mexico.

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“I’ll tell you what, I don’t know that I’ve ever been as nervous watching a baseball game as I was in this one,” Team USA manager Buck Martinez said. “What a great game that was. It’s a big relief, obviously. We were all very anxious for this game tonight. Japan is a very good baseball team.

“It was a well-played game, both teams showed tremendous hearts. There were great defensive plays and key pitching.”

Martinez said there’s no better big-game pitcher in baseball than Clemens, the 43-year-old right-hander who might be pitching his final game.

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“The other night when we were playing Korea, Roger was studying the Mexican hitters’ hitting charts,” Martinez said. “He is into it. We certainly hope to give him some run support and let him do his thing.”

Clemens, who has won 341 games in his big league career, has said he’s leaning toward retirement after the Classic.

South Korea went 3-0 in Round 2; the United States is 1-1, Japan finished 1-2, and Mexico is 0-2. The Americans beat Mexico 2-0 in the first round last week.

South Korea and Japan were scoreless when Min Jae Kim drew a one-out walk in the eighth off Toshiya Sugiuchi, and Byung Kyu Lee followed with a single. Center fielder Tatsuhiko Kinjoh’s throw to third arrived ahead of Kim, but Toshiaki Imae juggled the ball, and Lee took second on the play. Imae wasn’t charged with an error.

Kyuji Fugikawa relieved, and Jong Beom Lee lined a 2-1 pitch to the left-center field gap. Lee raised his fists in triumph as the ball dropped in, but he was thrown out trying to stretch the hit into a triple.

Tsuyoshi Nishioka homered off Dae Sung Koo to begin the bottom of the ninth for Japan’s only run. Noguhiko Matsunaka hit a one-out single before Seung Kwan Oh struck out the next two batters to end the game.

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South Korea beat Japan 3-2 in first-round action last week in Tokyo.

“I think we are as good as they are, but we lost,” Nishioka said through a translator. “We just have to face that Korea is a good team.

“We have to see how the U.S. does. We still have a chance.”

The game was played before an announced crowd of 39,679 at Angel Stadium, with most of the fans pulling for South Korea. They chanted and banged their blue and white Thunderstix, often cheered even when a South Korean hit a foul ball, and booed enthusiastically every time Japanese star Ichiro Suzuki came to the plate.

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