Lucas Miedler (; born 21 June 1996) is an Austrian professional tennis player. He has a career-high singles ATP ranking of World No. 201 achieved on 15 October 2018 and a doubles ranking of No. 33 achieved 8 May 2023. He has won five doubles titles on the ATP Tour with compatriot Alexander Erler, at home tournaments in 2021 Kitzbühel, in Vienna and 2023 Kitzbühel, and in Acapulco and Munich.
Junior career
He won the boys' doubles at the 2014 Australian Open where he partnered with Australian Bradley Mousley, defeating the French duo of Quentin Halys and Johan-Sébastien Tatlot 6–3, 7–6(7–3).
Professional career
2015: ATP debut
In 2015, Miedler made his ATP World Tour main draw debut by qualifying to the first round of the Vienna Open, where he lost in three sets to Latvian Ernests Gulbis.
2021-2022: Maiden ATP and ATP 500 doubles titles
At the 2021 Generali Open Kitzbühel, he won the doubles title partnering Alexander Erler.
The Austrian team of Erler/Miedler clinched their second and biggest title on home soil at the ATP 500 2022 Erste Bank Open without dropping a set.
2023: Major and Masters debuts & first wins, Second ATP 500 title, top 40 debut
At the 2023 Australian Open the pair Miedler/Erler made their Grand Slam debut where they defeated tenth seeds Rohan Bopanna and Matthew Ebden.
At the Mexican Open Miedler won his third title with compatriot Erler defeating en route top seeds Wesley Koolhof and Neal Skupski. As a result Miedler made his top 50 debut on 6 March 2023 at world No. 43.
Miedler partnering Cameron Norrie made his Masters debut at the 2023 BNP Paribas Open and won his first match at the Masters 1000 level.
At the 2023 Grand Prix Hassan II the pair Miedler/Erler reached the final defeating fifth seeds Maxime Cressy and Albano Olivetti. They lost in the final to Andrea Vavassori and Marcelo Demoliner.
They won their fourth title at the 2023 BMW Open in Munich, Germany.
They entered the 2023 Mutua Madrid Open as alternate pair on their debut at this tournament.
Doubles performance timeline
Current through the 2023 Shanghai Masters.
ATP career finals
Doubles: 6 (5 titles, 1 runner up)
ATP Challenger and ITF Futures/World Tennis Tour finals
Singles: 24 (10–14)
Doubles: 61 (38–23)