 Transitioning into a senior role for the Colorado defense, Liles scored his 50th career goal against the Toronto Maple Leafs on January 29, 2009, to become only the fifth defender in Quebec/Colorado history to achieve the feat.Hampered by a re-occurring shoulder injury midway through the 2009–10 season, Liles also struggled with returning to form and was a healthy scratch for a brief period of time for the first time in his NHL career.Despite playing in a career-low 59 regular season games for 31 points, he still led the resurgent youth-laden Avalanche team in defenseman scoring for a fourth consecutive season.