Roy Oswalt officially has accepted his proposed trade to the Philadelphia Phillies.

After considering his options and speaking with friends familiar with the Phillies' situation, including former teammate Brad Lidge, the Houston Astros' staff ace waived his no-trade clause Thursday in order to be dealt for left-handed starter J.A. Happ and two prospects, the Phillies said in announcing the trade.

"I'm glad it worked out for both of us. I wanted to go to a contender, and Houston gets some good prospects in return who will hopefully allow them to build a winning team," Oswalt told ESPN.com's Amy K. Nelson.

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