BOSTON (AP) -The Boston Red Sox called up Bartolo Colon from Pawtucket and sent right-hander Justin Masterson to the Triple-A team on Wednesday.

Colon, the AL Cy Young award winner in 2005, started Wednesday night's game against the Kansas City Royals.

The Red Sox signed Colon to a minor league contract in spring training after he became a free agent following four seasons with the Angels. He was 21-8 with a 3.48 ERA in 2005, but injuries limited him to 29 games the past two seasons.

The right-hander was 6-8 with a 6.34 ERA last season in 19 games, 18 of them starts. He was on the disabled list from July 24 to Sept. 9 with irritation in his right elbow. In his last appearance in 2007, he had two strikeouts in a scoreless relief inning on Sept. 29 against Oakland.

In three rehab starts for Pawtucket, Colon was 2-0 with a 0.64 ERA.

Masterson was sent down after allowing one run in 6 1-3 innings of Tuesday night's 2-1 win over the Royals, his first major league decision. He had been recalled before the game because Boston needed a starter after playing a doubleheader Saturday.Copyright © 2005 The Associated Press. All rights reserved. The information contained in the AP News report may not be published, broadcast, rewritten or redistributed without the prior written authority of The Associated Press.