| Japan Open - Feminin | 08/24 10:05 | 2 | Supanida Katethong v Akane Yamaguchi | L | 0-2 | |
| Japan Open - Feminin | 08/23 02:55 | 3 | Supanida Katethong v Beiwen Zhang | W | 2-1 | |
| Japan Open - Feminin | 08/22 10:00 | 4 | Ester Nurumi Tri Wardoyo v Supanida Katethong | W | 1-2 | |
| Japan Open - Feminin | 08/21 06:40 | 5 | Shuo Yun Sung v Supanida Katethong | W | 1-2 | |
| Jocurile Olimpice 2024 - Feminin | 08/01 16:30 | 4 | Akane Yamaguchi v Supanida Katethong | L | 2-0 | |
| Jocurile Olimpice 2024 - Feminin | 07/30 18:20 | - | Supanida Katethong v Sin Yan Happy Lo | W | 2-0 | |
| Jocurile Olimpice 2024 - Feminin | 07/27 12:50 | - | Supanida Katethong v Juliana V. Viera | W | 2-0 | |
| Indonesia Open - Feminin | 06/06 07:15 | 4 | Gregoria Mariska Tunjung v Supanida Katethong | L | 2-0 | |
| Indonesia Open - Feminin | 06/04 08:50 | 5 | Supanida Katethong v Pornpawee Chochuwong | W | 2-0 | |
| Singapore Open - Feminin | 05/28 02:00 | 5 | Yu Po Pai v Supanida Katethong | L | 2-1 | |
| Thailand Open - Feminin | 05/19 06:00 | 1 | Yue Han v Supanida Katethong | W | 0-2 | |
| Thailand Open - Feminin | 05/18 05:00 | 2 | Supanida Katethong v Zhi Yi Wang | W | 2-1 |
Supanida Katethong (Thai: ศุภนิดา เกตุทอง; born 26 October 1997) is a Thai badminton player. She won the gold medal in the women's singles at the 2023 SEA Games, and also part of Thai winning team at the Games in 2021 and 2023. Known as May Sai (Thai: เมย์ซ้าย, lit. 'left May'), this is to avoid confusion with another May, which is Ratchanok "May" Intanon. She is also a left-handed player.
Katethong started playing badminton at aged nine, and join the Thailand national junior team in 2015. She won her first international title at the 2014 Singapore International tournament in the women's singles event. In the early of 2015, she won the women's singles title at the Granular Thailand International Challenge tournament. In May 2015, she won double titles at the Smiling Fish International tournament in the women's singles and doubles event. She also won the Sri Lanka International tournament in the women's singles event.
Katethong opened the 2023 season as a semi-finalist in the India Open, losing to the then world number 1 Akane Yamaguchi. She also reached the semi-finals in the Thailand Masters. In May, Katethong competed at the SEA Games in Cambodia, and won the gold medals in the women's singles and team events. On 16 July, she won her first BWF World Tour title at the 2023 U.S. Open after defeating Gao Fangjie in two straight games. In the next two tournaments, she was defeated by her compatriot Ratchanok Intanon in the second round of the Japan Open, and in the quarter-finals of the Australian Open.