 Complete the following phrase:  López served four stints with Boston in 2006. In 2007, he had three different stints but appeared in 61 games, posting a 3.10 earned run average ERA. He posted a 15.43 ERA in the playoffs but won his first World Series ring as the Red Sox defeated Colorado in four games. In 2008, he spent the entire season on a major league roster for the first time since 2003. He posted a 9.26 ERA in his first 14 games of 2009 before getting sent to the minors for the rest of the season. In 2010, he signed with the Pittsburgh Pirates but was traded to the San Francisco Giants during the season. He had his lowest ERA that year 2.34 and won another 