She also helped set a new national relay record and became Japan's first ever female sprint semi-finalist at the 2007 World Championships.

She mainly competes on the Japanese athletics circuit, running at the Osaka Grand Prix, Shizuoka International and the Super Meet in Kawasaki.

A native of Yabuki, Fukushima,[2] Asami Tanno won her first international medals at the 2002 Asian Junior Athletics Championships, taking the 400 m silver behind Sathi Geetha and a bronze with the Japanese relay team.

[8] She competed in the 2006 IAAF World Cup, forming part of the Asian women's 4×400 metres relay team, but ended up in last place.

[8][22] Returning to the Osaka GP, she set a national record of 3:30.53 in the 4×400 m relay with Mayu Kida, Satomi Kubokura and Makiko Yoshida, and also took second place behind Mary Wineberg in the individual race.

[26] She won her second silver of the competition with the Japanese 4×400 m relay, beaten to the gold again by the Indian athletes.

[36] Tanno repeated her performance from the previous year in the Osaka GP, taking third behind foreign opposition – Australian Tamsyn Lewis and American Latosha Wallace.

[39] A Japanese team of Aoki, Tanno, Sato (née Kida) and Kubokura did not perform well in the 4×400 metres relay competition, finishing last in their heat with 3:34.46.

[40] After the World Championships, she competed at the Super Meet in Kawasaki, beating off Barbara Petráhn and Maris Mägi to win the 400 m.[41] She was married in February 2010.

She failed to defend her national title in 2010 after suffering injuries earlier in the season, leaving Chisato Tanaka to take the victory.