Katherine "Kat" Westbury (; born 14 March 1993) is an inactive Thai-New Zealand tennis player.
She reached her best singles ranking of world No. 576 on 3 October 2011, and made her WTA Tour debut at the 2015 Auckland Open.
Westbury has two brothers. Aged three she moved to Bangkok, Thailand with her parents where she attended pre-school and primary school. Westbury began playing tennis at the age of 6 at the British Club in Bangkok. Her family returned to New Zealand two years later, settling in Christchurch, where she attended Burnside Primary School and Cobham Intermediate School, while also playing on the Canterbury Tennis Regional Squad under coach Glenn Wilson. In 2005 the family moved to Sydney, before further re-locating to Burwood East, Victoria, where she still resides.
Tennis career 2015 Having played doubles in just one previous ITF tournament, and that being six years earlier, Westbury was awarded a wildcard into the Auckland Open with Rosie Cheng; they were beaten by Petra Martić and Anna Tatishvili in the first round.
2018 Westbury played her first Fed Cup matches for New Zealand in Bahrain in February 2018. She won her only singles rubber, and won one and lost one doubles rubber.
2020 Westbury resumed her professional career in 2020, starting at the reintroduced ITF tournament in Hamilton. She reached the semifinals of both singles and doubles, and followed that by reaching the second round of singles in Mildura before international tennis was suspended due to the COVID-19 pandemic. She resumed after the break with a series of tournaments in Monastir, Tunisia.
2022 Westbury played one Billie Jean King Cup (formerly Fed Cup) match for New Zealand in April but, more importantly, won her first professional title when partnering Destanee Aiava to win an ITF doubles title in Traralgon, Australia, at the end of November.
ITF Circuit finals Singles: 2 (runner-ups) W10 tournaments (0–2)
ResultW–LDateTournamentSurfaceOpponentScoreLoss 0–1 Sep 2010W10 Jakarta, Indonesia Hard Sandy Gumulya 3–6, 0–6Loss 0–2 Jul 2013W10 Bangkok, Thailand Hard Lu Jiajing 7–5, 3–6, 3–6
Doubles: 1 (title) LegendW25 tournaments (1–0)Finals by surfaceHard (1–0) ResultW–LDateTournamentSurfacePartnerOpponentsScoreWin 1–0 Nov 2022W25 Traralgon, Australia Hard Destanee Aiava Ankita Raina Priska Madelyn Nugroho 6–1, 4–6, [10–5]
Fed Cup participation Singles EditionStageDateLocationAgainstSurfaceOpponentW/LScore 2018 Fed Cup Asia/Oceania Zone Group II R/R 7 February 2018 Bahrain Lebanon Hard Nancy KarakyW 6–0, 6–0 2022 Billie Jean King Cup Asia/Oceania Zone Group I R/R 16 April 2022 Antalya, Turkey Indonesia Clay Aldila SutjiadiL 1–6, 1–6
Doubles EditionStageDateLocationAgainstSurfacePartnerOpponentsW/LScore 2018 Fed Cup Asia/Oceania Zone Group II R/R 8 February 2018 Bahrain Uzbekistan Hard Emily Fanning Akgul Amanmuradova Yasmina KarimjanovaL 5–7, 1–6 P/O 9 February 2018 Pakistan Sarah Mahboob Khan Mahin QureshiW 6–3, 6–1
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