Pitcher Daisuke Matsuzaka might miss Boston's March 25-26 series against the Oakland Athletics at the Tokyo Dome because his wife is expecting to deliver their second baby around that time. Red Sox president Larry Lucchino said the team and the commissioner's office were aware of the potential conflict.

"We're hopeful that their second child will be born at such a time to allow him to participate," Lucchino said today in a conference call. "We are hopeful, but we do recognize that he has an important obligation with respect to the birth of that child."

Matsuzaka's first child was born in Japan. It's not clear whether the Matsuzakas plan to deliver in Japan or the United States this time.

The Red Sox paid a record $51.11 million for the rights to talk to Matsuzaka last offseason and another $52 million to sign him for six years. He went 15-12 with a 4.40 ERA as a rookie, and after stumbling in his first two playoff starts he won his last two to help the Red Sox win their second World Series in four seasons.

Even if he can't pitch in his homeland, the Red Sox won't be visiting empty-handed. Lefty Hideki Okajima, who was a key part of the Boston bullpen in the regular and postseason, could return to the stadium where he spent most of his 12-year Japanese big league career.

The Japan trip had been in the planning for months as baseball officials tried to make the trip more comfortable for the players and gain their consent. Lucchino said the team would fly on a "bigger, better" plane, and stop in California on the way back for three exhibition games against the Dodgers and their U.S. opener at the A's on April 1.

Pitcher Curt Schilling said on a Boston radio stadium the players met last week and discussed their concerns.

"They're trying to build in safeguards around it, and if they can do that, from a travel standpoint, it's a great idea," he said. "I'm not going to pitch over there, so I'm going to have fun. But this is definitely going to present a challenge and the one thing I know is this organization will do everything it can to make sure we're rested and ready to go when it kicks off for real."

To ease the discomfort, there will be days off after crossing the Pacific and before the games in Oakland. Also, the Red Sox and A's will be allowed to leave three players, probably pitchers, behind and add three others to their roster for the Japanese portion of the trip.

"As much as MLB wanted us to go, and thought it was important that we go, we were concerned with what impact it would have on our players and the competitiveness of the schedule next year," Lucchino said. "Only recently when the details were made concrete could we consider it."

Here's how the schedule works out:

—The Red Sox and A's will play exhibition games on March 22-23 against Japanese teams.

—Boston and Oakland will open the 2008 season with games on March 25-26; Oakland will be the home team. The Red Sox will leave after the second game and, because they cross the international date line, arrive in Los Angeles the same day.

—Boston will take March 27 off and then play a three-game exhibition series against the Dodgers, with two games at Dodgers Stadium and one planned for the Los Angeles Coliseum, where the Dodgers played for four seasons after moving West from Brooklyn 50 years ago.

— The Red Sox and A's will resume their regular-season schedule with a two-game series at Oakland April 1-2.

The Japan visit is one of two Asian trips Major League Baseball hopes to make next year. Talks have been under way for months to have the Dodgers and San Diego Padres play exhibition games in Beijing, most likely on March 14-15, at the ballpark to be used for the 2008 Olympics.

That would be Major League Baseball's first trip to China.

Boston and Oakland will be the third set of teams to open the regular season at the Tokyo Dome, following the New York Mets and Chicago Cubs (2000), and the New York Yankees and Tampa Bay Devil Rays (2004). A scheduled 2003 series between Oakland and Seattle at the Tokyo Dome was canceled because of the threat of war in Iraq.

"Opening our regular season in Japan for the third time is another example of Major League Baseball's commitment to continue the global growth of the game," commissioner Bud Selig said in a statement.

Also today, the Red Sox announced their 2008 schedule and ticket prices, which rose about 9 percent. Field box seats will cost $125, up from $105, while upper bleachers and standing room remain at $12 and $20, respectively.

"We need revenue to fuel the vision that we have, and the vision is for a competitive, entertaining, winning team, year-in and year-out," Lucchino said. "Revenue is the gasoline that makes the car go in those directions."

Lucchino also raised the specter of the New York Yankees, who will move into a new stadium in 2009.