Career
She competed for Japan at the 1984 Summer Olympics in Los Angeles, California, although she failed to finish the race. Masuda set her personal best in the classic distance (2:30:30) in 1983. She rose to prominence with a gold medal on the track over 3000 metres at the 1981 Asian Athletics Championships and by winning the inaugural 20 km women"s race at the Sapporo Half Marathon event.
She was the runner-up at the 1984 Osaka Ladies Marathon, a result which led to her the starting line of the first Olympic women"s marathon.
Among her other results, she was third at the 1989 Hokkaido Marathon and took 19th place at the 1990 London Marathon.
