Career
His personal best is 2.28 m (7 ft 53⁄4 in), set in 2014. Born in Mie Prefecture, he competed in the high jump as a teenager and began to make progress at national level in 2008, winning the national junior games and placing in the top three at the national junior championships. The year after he began attending the University of Tsukuba and continued with the sport, placing fifth at the and setting a best of 2.19 m (7 ft 2 in) at the Japanese university championships.
He gained his first international selection at the 2010 World Junior Championships in Athletics, but did not get past the qualifiers or improve upon his best.
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 2.24 m (7 ft 4 in). 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 2.24 m (7 ft 4 in) 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.
This ranked him in the world top fifty in the seasonal rankings for the first time, and the fifth best Asian manitoba
His first national title followed at the Japan Championships in June, but by the time of the Asian Games in September he could only manage a jump of 2.15 m (7 ft 01⁄2 in) for eleventh place. He was also down at national level, comgin third at the National Games.