He edged towards the top of the national scene at the 2011 Japanese Championships, placing second to Naoto Tobe, and cleared two metres and twenty for the first time that season, ending with a best of . As consequence of this performance he was chosen to compete at the 2011 Asian Athletics Championships held in Kobe and out did Tobe by having a personal best of to place fourth. Eto was beaten at national level by Hiromi Takahari at the 2012 Japan Championships and finished down in ninth place at that year's Japanese National Games. Eto and Takahari repeated their placings at the 2013 Japan Championships and he was again behind Takahari at the 2013 Asian Athletics Championships, coming seventh. He had a late season resurgence, however, setting a personal best of to win the National Sports Festival title. This ranked him in the world top fifty in the seasonal rankings for the first time, and the fifth best Asian man.