| Australian Open Women | 01/09 03:20 | 14 | [194] Kayla Day v Ekaterina Vl. Makarova [228] | 6-2,1-6,6-4 | |
| WTA Midland | 11/02 16:00 | 25 | [116] Su Jeong Jang v Kayla Day [176] | 6-3,3-6,6-3 | |
| WTA Midland | 10/31 14:00 | 19 | [176] Kayla Day v Francesca Di Lorenzo [267] | 6-3,6-3 | |
| WTA Midland | 10/30 14:00 | 14 | [176] Kayla Day v Emina Bektas [365] | 6-7,7-5,6-3 | |
| ITF W80 Tyler | 10/25 22:00 | 25 | [176] Kayla Day v Yue Yuan [83] | 4-6,6-3,2-6 | |
| WTA Guadalajara | 10/18 19:10 | 24 | [430] Eugenie Bouchard v Kayla Day [194] | 7-5,6-3 | |
| WTA Guadalajara | 10/16 19:00 | 19 | [216] Kayla Day v Coco Vandeweghe [143] | Retired | |
| WTA Guadalajara | 10/15 18:55 | 14 | [86] Julia Grabher v Kayla Day [216] | 2-6,6-4,4-6 | |
| ITF W25 Redding | 10/09 19:00 | 29 | [283] Jamie Loeb v Kayla Day [212] | 3-6,4-6 | |
| ITF W25 Redding | 10/09 01:00 | 28 | Liv Hovde v Kayla Day | 4-6,6-7 | |
| ITF W25 Redding | 10/07 17:55 | 27 | [321] Karman Kaur Thandi v Kayla Day [212] | 4-6,6-3,6-7 | |
| ITF W25 Redding | 10/06 21:40 | 26 | Charlotte Chavatipon v Kayla Day | 2-6,5-7 | |
| ITF W25 Redding | 10/05 19:15 | 25 | [57] Aldila Sutjiadi v Kayla Day [212] | 4-6,4-6 | |
| ITF W60 Templeton | 09/28 17:00 | 25 | [194] Kayla Day v Maria Mateas [418] | 7-6,2-6,1-6 | |
| ITF W60 Berkeley | 09/23 18:20 | 27 | [198] Kayla Day v Diana Shnaider [246] | 1-6,2-6 | |
| ITF W60 Berkeley | 09/22 18:30 | 26 | [326] Peyton Stearns v Kayla Day [198] | 6-7,6-7 | |
| ITF W60 Berkeley | 09/21 19:20 | 25 | [275] Maribella Zamarripa v Kayla Day [198] | 0-6,6-1,3-6 | |
| US Open Women | 08/25 22:00 | 15 | [306] Georgina Garcia-Perez v Kayla Day [211] | 6-4,1-6,6-4 | |
| US Open Women | 08/24 22:30 | 14 | [211] Kayla Day v Irina Maria Bara [126] | 6-1,6-1 | |
| WTA Concord | 08/09 16:25 | 25 | [213] Kayla Day v Bernarda Pera [56] | 4-6,5-7 | |
| WTA Concord | 08/08 14:00 | 19 | [130] Moyuka Uchijima v Kayla Day [213] | 3-6,6-4,0-6 | |
| WTA Concord | 08/07 14:00 | 14 | [257] Jamie Loeb v Kayla Day [230] | 2-6,1-6 | |
| WTA San Jose | 08/02 17:00 | 25 | [230] Kayla Day v Caroline Dolehide [168] | 6-7,4-6 | |
| WTA San Jose | 07/31 20:55 | 19 | [232] Grace Min v Kayla Day [231] | 2-6,6-1,4-6 | |
| WTA San Jose | 07/30 23:30 | 14 | [231] Kayla Day v Carol Zhao [187] | 6-4,3-6,7-6 | |
| ITF W60 Evansville | 07/23 15:00 | 26 | Kayla Day v Elizabeth Mandlik | Walkover | |
| ITF W60 Evansville | 07/20 13:30 | 25 | [234] Kayla Day v Ellie Douglas [319] | 6-2,7-6 | |
| ITF W25 Wichita | 06/26 16:45 | 29 | [265] Kayla Day v Elizabeth Mandlik [323] | 3-6,3-6 | |
| ITF W25 Wichita | 06/25 16:55 | 28 | Kayla Day v Samantha Crawford | 6-4,3-6,6-4 | |
| ITF W25 Wichita | 06/24 16:20 | 27 | Kayla Day v Jenna Defalco | Retired |
Wikipedia - Kayla Day
Kayla Day (born September 28, 1999) is an American professional tennis player. She has a career-high singles ranking of world No. 84 by the WTA. As a junior, she won one junior Grand Slam title, at the 2016 US Open. There, she finished runner-up in the doubles event, partnering with Caroline Dolehide.
Despite having success as junior, Day has mostly spent time playing on the ITF Women's Circuit instead of WTA Tour, due to her ranking. She officially turned professional in 2017, at the Australian Open.