Boston ? American League Rookie of the Year Angel Berroa and the Kansas City Royals agreed Friday to an $11 million, four-year contract extension.

The shortstop, who is making $372,500 this season, will get $500,000 in 2005, $2 million in 2006, $3.25 million in 2007 and $4.75 million in 2008. Kansas City has a $5.5 million option for 2009 with a $500,000 buyout.

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“Angel was a key component to our success last season,” general manager Allard Baird said. “It was important for us to sign him to a long-term deal as we continue to build this ballclub.”

Berroa, 26, hit .287 with 17 homers and 73 RBIs last year. This season, he was hitting .214 with one homer and four RBIs when migraine headaches forced him onto the 15-day disabled list after only 14 games.