Sinja Kraus (born 29 April 2002) is an Austrian tennis player. She has career-high WTA rankings of world No. 99 in singles achieved on 23 February 2026 and No. 238 in doubles, achieved in January 2026. Kraus has won one WTA 125 singles title as well as 13 singles and two doubles titles on the ITF Circuit.
Kraus represents Austria in the Billie Jean King Cup since 2020.
Kraus also won a bronze medal at the 2017 European Youth Summer Olympic Festival in Gyà Âr.
She reached a career-high ITF juniors ranking of world No. 87, on 21 January 2019.
Kraus made her WTA Tour main-draw debut as a wildcard entrant at the 2021 Upper Austria Ladies Linz, losing to Alison Van Uytvanck in the first round.
As a qualifier, she defeated eighth seed Nadia Podoroska to reach the second round at the WTA 125 2023 Bogota Open, where she lost to Nuria Brancaccio.
Kraus qualified for the main draw at her home tournament, the WTA 500 2025 Upper Austria Ladies Linz.
Kraus won her first WTA 125 title at the 2025 Cali Open, defeating Panna Udvardy in the final.
Kraus defeated compatriot Julia Grabher in first all-Austrian match since 2014, at the 2026 ASB Classic. Krauss reached the top 100 in the WTA singles rankings on 23 February 2026 at world No. 99.
Kraus qualified for the main draw for her debut at the WTA 1000-level, at the 2026 Miami Open, but lost to Alycia Parks in straight sets.
Kraus represents Austria in the Billie Jean King Cup and made her debut in 2020, when she partnered Melanie Klaffner in the (then Fed Cup) tie against Italy, losing to Giulia Gatto-Monticone and Martina Trevisan.
Kraus was nominated to make her Fed Cup debut for Austria in 2019, while the team was competing in the Europe/Africa Zone Group II, the opponent forfeited the match.
* walkover doesn't count in her overall record.