Corbett's season was hindered by hamstring injuries and he started just two of Tipperary's six championship games. Tipperary's fortunes took a downturn over the next few years, with Corbett continuously suffering from injuries. He managed just a single seventy-minute championship stint under Michael Doyle in 2003, while he started just two championship games during Ken Hogan's tenure as manager, finishing neither. The appointment of Liam Sheedy as Tipperary's new manager saw Corbett take on a more prominent role as a goal-scoring forward. Tipperary remained undefeated during their 2008 league campaign and qualified for the decider against Galway. A Corbett goal proved decisive in the 3-18 to 3-16 victory. It was his second league medal. Corbett later collected a second Munster medal as Tipperary continued their winning streak with a 2-21 to 0-19 defeat of a resurgent Clare. Tipperary retained their provincial crown in 2009, with Corbett collecting a third Munster medal following a 4-14 to 2-16 defeat of Waterford. On 6 September 2009 Tipperary faced four-in-a-row hopefuls Kilkenny in the All-Ireland decider. For long periods Tipperary looked the likely winners, however, late goals from Henry Shefflin and substitute Martin Comerford finally killed off their efforts to secure a 2-22 to 0-23 victory. In spite of this defeat Corbett was later presented with his first All-Star. Three successive Munster titles proved beyond Tipperary, however, in spite of a shock defeat by Cork in the provincial quarter-final, Tipperary used the qualifiers to good effect and qualified for the All-Ireland decider on 5 September 2010. Kilkenny were the opponents once again as they sought a fifth successive All-Ireland crown title. "The Cats" lost talisman Henry Shefflin early in the game due to injury, while Corbett ran riot and scored a hat-trick of goals before Noel McGrath added a fourth. The 4-17 to 1-18 victory gave Corbett, who was named man of the match, his second All-Ireland medal. He later won a second successive All-Star while he also made a clean sweep of the three Hurler of the Year awards. Tipperary reclaimed the provincial crown in 2011 following a huge 7-19 to 0-19 drubbing of Waterford in the decider. Corbett, who scored 4-4 in that game, collected his fourth Munster medal.