| All England Open WD | 03/14 13:05 | 5 | Chen/Fan Jia v Iwanaga/Nakanishi | L | 2-0 | |
| German Open WD | 03/09 18:10 | 4 | Iwanaga/Nakanishi v Stoeva/Stoeva | L | 0-2 | |
| German Open WD | 03/08 16:25 | 5 | Lambert/Tran v Iwanaga/Nakanishi | W | 0-2 | |
| Indonesia Masters WD | 01/24 08:20 | 5 | Tan/Xia v Iwanaga/Nakanishi | L | 2-0 | |
| India Open WD | 01/20 07:50 | 3 | Tan/Thinaah v Iwanaga/Nakanishi | L | 2-0 | |
| India Open WD | 01/19 07:10 | 4 | Iwanaga/Nakanishi v Kim/Kong | W | 2-0 | |
| India Open WD | 01/18 04:10 | 5 | Nakanishi/Iwanaga v MacPherson/Torrance | W | 2-0 | |
| Malaysia Open WD | 01/10 03:30 | 5 | Kim/Kong v Iwanaga/Nakanishi | L | 2-1 | |
| Australian Open WD | 11/17 06:00 | 4 | Hsin Lee/Teng v Iwanaga/Nakanishi | L | 2-0 | |
| Australian Open WD | 11/16 02:20 | 5 | Ho/Zhang v Iwanaga/Nakanishi | W | 0-2 | |
| French Open WD | 10/25 08:50 | 5 | Iwanaga/Nakanishi v Paewsampran/Supajirakul | L | 0-2 | |
| Denmark Open WD | 10/20 09:40 | 4 | Iwanaga/Nakanishi v Baek/Lee | L | 0-2 | |
| Denmark Open WD | 10/19 10:20 | 5 | Hoo/Lim v Iwanaga/Nakanishi | W | 0-2 | |
| Japan Open WD | 08/30 01:20 | - | Matsumoto/Nagahara v Iwanaga/Nakanishi | L | 2-0 | |
| World Championships WD | 08/25 01:35 | 4 | Kititharakul/Prajongjai v Iwanaga/Nakanishi | L | 2-1 | |
| World Championships WD | 08/24 02:40 | 5 | Iwanaga/Nakanishi v Jille/Seinen | W | 2-0 | |
| Indonesia Open WD | 06/15 02:40 | 5 | Iwanaga/Nakanishi v Stoeva/Stoeva | - | Walkover | |
| Thailand Open WD | 05/17 09:40 | 5 | Iwanaga/Nakanishi v Jeong/Kim | L | 1-2 | |
| Asia Championships WD | 05/01 05:40 | 1 | Chen/Fan Jia v Iwanaga/Nakanishi | L | 2-0 | |
| Asia Championships WD | 04/30 06:00 | 2 | Hirota/Fukushima v Iwanaga/Nakanishi | W | 1-2 | |
| Asia Championships WD | 04/29 09:00 | 3 | Iwanaga/Nakanishi v Lee/Shin | W | 2-1 | |
| Asia Championships WD | 04/28 04:40 | 4 | Iwanaga/Nakanishi v Dinh/Khanh Pham | W | 2-0 | |
| Asia Championships WD | 04/27 08:20 | 5 | Iwanaga/Nakanishi v Low/Siow | W | 2-0 | |
| All England Open WD | 03/17 11:10 | 4 | Tan/Thinaah v Iwanaga/Nakanishi | L | 2-1 | |
| All England Open WD | 03/16 14:25 | 5 | Ponnappa/N. Sikki v Iwanaga/Nakanishi | W | 0-2 | |
| German Open WD | 03/10 14:25 | 4 | Iwanaga/Nakanishi v Stoeva/Stoeva | L | 0-2 | |
| German Open WD | 03/09 15:40 | 5 | Lambert/Tran v Iwanaga/Nakanishi | W | 0-2 | |
| World Championships WD | 12/17 13:30 | - | Iwanaga/Nakanishi v Kim/Kong | L | 0-2 | |
| World Championships WD | 12/16 12:00 | - | Li/Zheng v Iwanaga/Nakanishi | W | 1-2 | |
| World Championships WD | 12/16 09:00 | 6 | Iwanaga/Nakanishi v Polii/Rahayu | - | Walkover |