Head to Head
| ITF W60 Rome GA | 2022/02/01 15:00 | Lulu Sun v Kayla Day | 6-3,7-5 |
Home History
| WTA Mumbai | 2024/02/05 12:20 | Kayla Day v Sahaja Yamalapalli | 4-6,6-1,4-6 |
| Australian Open Women | 2024/01/15 00:00 | Kayla Day v Viktoriya Tomova | 4-6,2-6 |
| WTA Hobart | 2024/01/06 00:00 | Kayla Day v Viktoriya Tomova | 6-3,0-6,3-6 |
| WTA Auckland | 2024/01/02 05:15 | Yue Yuan v Kayla Day | 7-6,6-7,6-1 |
| ITF W80 Tyler | 2023/10/29 18:00 | Emma Navarro v Kayla Day | 6-3,6-4 |
| ITF W80 Tyler | 2023/10/28 17:45 | Ayana Akli v Kayla Day | 2-6,5-7 |
| ITF W80 Tyler | 2023/10/27 19:20 | Maria Kozyreva v Kayla Day | 4-6,4-6 |
| ITF W80 Tyler | 2023/10/27 02:40 | Amelia Rajecki v Kayla Day | 1-6,4-6 |
Away History
| ITF W50 Roehampton | 2024/02/15 15:10 | Barbora Palicova v Lulu Sun | 2-6,0-6 |
| ITF W50 Roehampton | 2024/02/14 16:10 | Merel Hoedt v Lulu Sun | 1-6,2-6 |
| WTA Hua Hin | 2024/01/27 08:15 | Mai Hontama v Lulu Sun | 6-2,6-2 |
| Australian Open Women | 2024/01/16 00:00 | Elisabetta Cocciaretto v Lulu Sun | 6-1,7-5 |
| Australian Open Women | 2024/01/12 03:30 | Zeynep Sonmez v Lulu Sun | 4-6,6-3,2-6 |
| Australian Open Women | 2024/01/11 04:15 | Su Jeong Jang v Lulu Sun | 1-6,6-1,4-6 |
| Australian Open Women | 2024/01/10 04:50 | Lulu Sun v Heather Watson | 6-4,6-3 |
| WTA Auckland | 2024/01/04 02:30 | Lulu Sun v Varvara Gracheva | 3-6,4-6 |