Robbie Keane is arguable the best Designated Player signing of all time. In the 125 games he played for the Galaxy, Keane scored 83 goals and logged 45 assists. On top of that Keane helped LA win the 2011, 2012, and 2014 MLS Cups after winning the MLS MVP award in 2014.
With everything that Keane has accomplished in the MLS, the Galaxy decided not to renew his contract following its expiration at the end of the 2016 season, opening up a DP spot for 2017 and beyond.