Lorenzo Giustino (; born 10 September 1991) is an Italian tennis player. He has a career-high ATP singles ranking of world No. 127 achieved on 12 August 2019 and a career-high ATP doubles ranking of No. 311 achieved on 15 April 2019. Giustino has won two singles titles and one doubles title on the ATP Challenger Tour.

Career Giustino made his ATP main-draw debut as a qualifier at the 2015 BRD Năstase Țiriac Trophy, where he lost to fifth seed Guillermo García López in the first round.

In June 2019, he won his first ATP Challenger singles title in Almaty, defeating Federico Coria in the final.

Giustino made his Grand Slam main-draw debut at the 2020 Australian Open, losing to Milos Raonic in the first round.

Giustino defeated Corentin Moutet 0–6, 7–6 (7), 7–6 (3), 2–6, 18–16 in the first round of 2020 French Open as a first time main-draw qualifier at this Major. The match was the second-longest in French Open history, lasting six hours and five minutes. It was Giustino's first ATP tour-level win. He lost to 12th seed Diego Schwartzman in the second round.

Giustino played in his first ATP 500 tournament at the 2021 Dubai Tennis Championships as a lucky loser receiving a bye into the second round after the withdrawal of 10th seed Borna Ćorić. He lost to Aljaž Bedene.

He qualified for his second ATP 500 at the 2023 Barcelona Open Banc Sabadell, losing to Alexander Shevchenko in the first round.

Giustino won his second ATP Challenger singles title at the 2025 Monastir Open, defeating Petr Brunclík in the final.

Performance timeline

Singles Tournament2014201520162017201820192020202120222023202420252026Grand Slam tournamentsAustralian OpenQ2AQ2Q1Q1Q11RQ2Q1AAAQ10–1French OpenQ2AAQ1AQ12RQ1Q2Q1AAQ11–1WimbledonQ1AAQ1AQ1NHQ1Q1AAAQ10–0US OpenAAQ3Q1Q3Q1AQ1AAAAQ10–0Win–loss0–00–00–00–00–00–01–20–00–00–00–00–00–01–2ATP Masters 1000Miami OpenAAAAAANHQ1AAAAA0–0Italian OpenAAQ1AAAAAAAAAA0–0ShanghaiAAAAAANHQ1AA0–0ParisAAAAAAAAAAAA0–0Win–loss0–00–00–00–00–00–00–00–00–00–00–00–00–00–0

Challenger and Futures finals

Singles: 33 (15–18) Legend (singles)ATP Challenger Tour (2–5)ITF Futures Tour (13–13)Titles by surfaceHard (2–5)Clay (13–13)Grass (0–0)Carpet (0–0)

ResultW–LDateTournamentTierSurfaceOpponentScoreLoss0–1Spain F10, BalaguerFuturesClay David Souto4–6, 4–6Loss0–2Turkey F23, TekirdağFuturesHard Brydan Klein3–6, 1–6Win1–2Turkey F25, İzmirFuturesClay Jason Kubler6–4, 3–6, 7–5Win2–2Turkey F10, AntalyaFuturesClay Simone Vagnozzi6–0, 6–3Loss2–3Spain F10, Les Franqueses del VallèsFuturesHard Iván Arenas-Gualdaw/oLoss2–4Italy F6, PozzuoliFuturesClay Matteo Trevisan5–7, 2–6Loss2–5Spain F5, ReusFuturesClay Jordi Samper Montaña3–6, 6–4, 5–7Win3–5Italy F20, PontederaFuturesClay Gianluca Mager7–6(7–3), 6–3Win4–5France F23, RodezFuturesHard (i) Grégoire Barrère6–3, 6–7(2–7), 6–1Win5–5Italy F16, BasilicanovaFuturesClay Walter Trusendi6–4, 6–4Win6–5France F13, Bourg-en-BresseFuturesClay Romain Jouan6–4, 6–2Win7–5Serbia F7, NišFuturesClay Kristijan Mesaroš3–6, 6–2, 6–4Loss7–6Sibiu, RomaniaChallengerClay Robin Haase6–7(2–7), 2–6Loss7–7Italy F6, Santa Margherita di PulaFuturesClay Václav Šafránek6–7(2–7), 7–6(9–7), 5–7Loss7–8Spain F2, ManacorFuturesClay Daniel Muñoz de la Nava4–6, 7–5, 3–6Win8–8Italy F5, Santa Margherita di PulaFuturesClay Martín Cuevas7–5, 7–5Win9–8Italy F7, Santa Margherita di PulaFuturesClay Gianluca Mager6–4, 6–1Loss9–9Launceston, AustraliaChallengerHard Lloyd Harris2–6, 2–6Loss9–10Zhangjiagang, China, P.R.ChallengerHard Marc Polmans4–6, 6–4, 6–7(4–7)Win10-10Almaty, Kazakhstan ChallengerClay Federico Coria6–4, 6–4Loss10–11Prague, Czech RepublicChallengerClay Pedro Cachin3-6, 6-7(4-7)Win11–11M25 Badalona, SpainWorld Tennis TourClay Alex Marti Pujolras3–6, 6–4, 6–3Loss11–12M25 Mataro, SpainWorld Tennis TourClay Guy den Ouden6–1, 5–7, 6–0Loss11–13M25 Bourg-en-Bresse, FranceWorld Tennis TourClay Marat Sharipov2–6, 3–6Win12–13M25 Sabadell, SpainWorld Tennis TourClay Nicolás Álvarez Varona7–5, 3–6, 6–2Loss12–14M25 Monastir, TunisiaWorld Tennis TourHard Gauthier Onclin4–6, 6–2, 5–7Win13–14M25 Badalona, SpainWorld Tennis TourClay Pol Martín Tiffon6–2, 2–6, 7–6(7–4)Loss13–15M25 Vic, SpainWorld Tennis TourClay Clément Tabur4–6, 6–7(2–7)Loss13–16M25 Villeneuve-Loubet, FranceWorld Tennis TourClay Remy Bertola6–7(3–7), 1–6Win14–16M25 Gijón, SpainWorld Tennis TourClay Pedro Vives Marcos6–1, 7–5Loss14–17M25 Santander, SpainWorld Tennis TourClay Javier Barranco Cosano3–6, 0–4 ret.Win15-17Monastir, Tunisia ChallengerHard Petr Brunclík7–5, 6–0Loss15-18Liège, Belgium ChallengerClay Florian Broska7–6(7–4), 4–6, 1–6

Doubles: 6 (3–3) Legend (doubles)ATP Challenger Tour (1–0)ITF Futures Tour (2–3)Titles by surfaceHard (0–1)Clay (3–2)Grass (0–0)Carpet (0–0)

ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreWin1–0Italy F18, CarpiFuturesClay Paolo Beninca Jacopo Marchegiani Alessandro Sarra6–4, 6–4Loss1–1Turkey F48, AntalyaFuturesHard Guillermo Olaso Andrei Ciumac Volodymyr Uzhylovskyi2–6, 6–4, [7–10]Loss1–2Spain F15, MadridFuturesClay Richard Becker Oliver Golding Alexander Ward3–6, 6–2, [5–10]Loss1–3Italy F28, EsteFuturesClay Fred Gil Francesco Picco Walter Trusendi4–6, 6–7(8–10)Win2–3Spain F2, ManacorFuturesClay David Vega Hernández Pietro Rondoni Jacopo Stefanini7–5, 7–5Win3–3Shymkent, KazakhstanChallengerClay Gonçalo Oliveira Lucas Miedler Sebastian Ofner6–2, 7–6(7–4)

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