Yoshiko Iwata
Yoshiko Iwata is a former Japanese badminton player from the Yonex team. Iwata graduated from the Shijonawate Gakuen Junior College. she competed at the Summer Olympics in Sydney, Australia. Iwata was the women's doubles champion at the National Championships in 1996 and 1998. She won some international tournament in Australia, Cuba, Guatemla, and Carebaco in 2003, also in Peru in 2004. She was selected as Yonex badminton manager in 2010.
Achievements
Asian Championships
Women's doubles| Year | Venue | Partner | Opponent | Score | Result |
| 1992 | Cheras Indoor Stadium, Kuala Lumpur, Malaysia |  Fujimi Tamura |  Ladawan Mulasartsatorn Piyathip Sansaniyakulvilai | 8–15, 8–15 | Bronze |
IBF World Grand Prix
The World Badminton Grand Prix sanctioned by International Badminton Federation since 1983.Women's doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 2003 | U.S. Open | Miyuki Tai |  Ha Jung-eun Lee Eun-woo | 15–5, 15–4 | Winner |
| 2000 | German Open | Haruko Matsuda |  Lu Ying Huang Sui | 5–15, 3–15 | Runner-up |
| 2000 | Polish Open | Haruko Matsuda |  Britta Andersen Lene Mørk | 15–4, 15–10 | Winner |
| 2000 | Swedish Open | Haruko Matsuda | Jane F. Bramsen Pernille Harder | 12–15, 15–17 | Runner-up |
| 1997 | Denmark Open | Haruko Matsuda | Ann Jørgensen Majken Vange | 16–18, 5–15 | Runner-up |
| 1997 | U.S. Open | Haruko Matsuda | Qin Yiyuan Tang Yongshu | 6–15, 2–15 | Runner-up |
| 1997 | Chinese Taipei Open | Haruko Matsuda | Park Soo-yun Yim Kyung-jin | 12–15, 8–15 | Runner-up |
IBF International
Women's doubles| Year | Tournament | Partner | Opponent | Score | Result |
| 2004 | Peru International | Miyuki Tai |  Helen Nichol Charmaine Reid | 15–3, 6–15, 15–8 | Winner |
| 2004 | Iran Fajr International | Miyuki Tai |  Jiang Yanmei Li Yujia | 4–15, 12–15 | Runner-up |
| 2004 | Swedish International | Miyuki Tai |  Kamila Augustyn Nadieżda Kostiuczyk | 5–15, 3–15 | Runner-up |
| 2003 | Guatemala International | Miyuki Tai |  Felicity Gallup Joanne Muggeridge | 15–12, 15–1 | Winner |
| 2003 | Southern Pan Am Classic | Miyuki Tai | Felicity Gallup Joanne Muggeridge | 15–2, 15–4 | Winner |
| 2003 | Ballarat International | Miyuki Tai |  Jane Crabtree Kate Wilson-Smith | 15–4, 15–6 | Winner |
| 2003 | Carebaco International | Miyuki Tai | Helen Nichol Charmaine Reid | 15–5, 15–5 | Winner |
| 2003 | South Africa International | Miyuki Tai | Chikako Nakayama Keiko Yoshitomi | 15–4, 4–15, 5–15 | Runner-up |
| 2003 | Croatian International | Miyuki Tai | Kamila Augustyn Nadieżda Kostiuczyk | 11–8, 11–8 | Winner |
| 2003 | Cuba International | Miyuki Tai | Helen Nichol Charmaine Reid | 15–6, 15–4 | Winner |
| 2003 | French International | Miyuki Tai |  Elena Shimko Marina Yakusheva | 11–1, 7–11, 11–9 | Winner |
| 2002 | Macau Satellite | Miyuki Tai | Wang Xin Yuan Ting | 11–7, 9–11, 6–11 | Runner-up |