Janssen won his first two games against the Los Angeles Angels, both times posting solid outings, allowing fewer than three hits over seven innings each. In , with multiple injuries to the Blue Jays rotation and bullpen, Janssen made a move to the bullpen and performed very well as the set-up man for interim closer Jeremy Accardo. He led the bullpen in innings pitched, and was second in team saves with six. Janssen established himself as one of the best in the Toronto Blue Jays bullpen as well as in the American League. Janssen missed the entire 2008 season with a torn labrum. He was expected to make a full recovery and to be ready for Spring Training 2009 either out of the bullpen or as a starter, but suffered a setback and did not make the Opening Day 2009 roster for Toronto. On May 23, 2009, Janssen returned to action facing the Atlanta Braves in interleague play, going 6 innings and giving up 8 hits and 3 earned runs in a 4–3 decision giving him his first loss of the season. On June 17, 2009, it was announced that Janssen was placed on the 15-day disabled list, retroactive to June 14, with inflammation of his right shoulder. Janssen made 56 appearances in 2010, garnering a 5–2 record with a 3.67 ERA. 2011–2012 Janssen had a fantastic season in 2011, recording a 6–0 record with a career-low 2.26 ERA in 55 appearances. Janssen also recorded 2 saves, beginning his transition into the new Blue Jays closer. On February 13, 2012, Janssen signed a two-year, $5.9 million extension with the Blue Jays. His deal includes a $4 million club option for 2014. He will earn $2 million in 2012 and $3.9 million in 2013. In arbitration, Janssen asked for $2.2 million, but the Jays countered with $1.8 million. His contract will cover his final arbitration year and his first free-agent year. He was scheduled to have an arbitration hearing the next day. On November 16, 2012, Janssen had surgery to repair "lingering AC joint soreness". Janssen was voted by the Baseball Writers' Association of America (BBWAA) as the top Blue Jays pitcher of 2012, narrowly edging out Brandon Morrow. On February 5, 2013, manager John Gibbons said that, barring injury, Janssen would have the closer role for the start of the 2013 regular season, over teammate Sergio Santos. Janssen recorded a