On a day like no other in baseball history, two Cy Young Award winners in their primes changed teams.

The four-club, nine-player megatrade became official Wednesday, with the Toronto Blue Jays sending 2003 AL Cy Young Award winner Roy Halladay to the Philadelphia Phillies, who in turn dealt 2008 AL Cy Young winner Cliff Lee to the Seattle Mariners.

Halladay got a $60 million, three-year contract extension through 2013 in exchange for waiving his no-trade clause, and Toronto paid Philadelphia $6 million as part of the swap. Seven prospects changed hands, with Oakland also part of the mix.

"This is where we wanted to be," Halladay said at Citizens Bank Park in Philadelphia. "It was an easy decision for me. Once the opportunity came up for me to be part of this, it was something I couldn't pass up."

Two Cy Young winners had never been traded on the same day. And that wasn't the only big deal.

Boston finalized an $82.5 million, five-year contract for pitcher John Lackey and a $15.5 million, two-year agreement with outfielder Mike Cameron. The Red Sox also must figure out whether the Mike Lowell-to-Texas trade will go through and have been discussing whether to acquire Adrian Gonzalez from San Diego, a deal that could send Clay Buchholz and/or Jacoby Ellsbury to the Padres.

"I was always interested in coming here. Winning was definitely my first priority of a team to go to," Lackey said. "I've been knocked out of the playoffs a few times by them. I know I'm going to have a chance to win here, and that means a lot."

World Series MVP Hideki Matsui finalized a $6 million, one-year contract with the Los Angeles Angels, ending his seven-season run with the New York Yankees.

"This is the beginning of a new journey for me," Matsui said through a translator. "I'd like to do my best in every way I can to bring another world championship to this team since they won in 2002."

The Yankees haven't been close to making any moves since acquiring Curtis Granderson from Detroit last week. New York, which planned to introduce the center fielder on Thursday, is far apart from left fielder Johnny Damon, who has asked for a $39 million, three-year deal.

The Baltimore Orioles landed a proven lefty for the back of their bullpen, reaching a preliminary agreement on a $12 million, two-year contract with Mike Gonzalez, according to a person familiar with the negotiations.

The deal is pending a physical, according to the person, who spoke on condition of anonymity Wednesday night because the contract had not been completed.