sentences:  The 2012–13 season proved successful for Sexton as he helped Leinster win their first Pro 12 title since the Celtic league, having been runners up the previous three seasons.Despite the disappointment of failing to gain access to the knockout stages of the Heineken cup that year, Sexton helped Leinster win their first Amlin Challenge Cup, a third European title in three years.He spent a portion of the season sidelined due to injury, allowing his understudy Ian Madigan to take the hot seat at outside half.