2021–2023: ATP singles and doubles debut, 15 wildcards with Stefanos, 100th career wildcard

The brothers first partnered at the 2021 Australian Open, where they received their first team wildcard to the main draw but lost in the first round. The next two tournaments were the 2021 Rotterdam Open and 2021 Open 13 Provence in Marseille, France where they entered as main draw wildcards and lost in the second and first rounds respectively.

Petros made his ATP singles debut as a wildcard as well to the main draw of the event at the 2021 Open 13, but lost to Alejandro Davidovich Fokina in the first round in 45 minutes.^[1] The misuse of wildcards in that case of Petros Tsitsipas individually and in general for the brothers has been brought up by players and fans.^[2][3]

They next partnered at the 2021 Monte-Carlo Masters after receiving a fourth team wildcard to the event. They reached the round of 16 by beating 8th seeded Kevin Krawietz and Horia Tecău. The pair received yet another wildcard for the next Masters 1000 at the 2021 Mutua Madrid Open but lost again in the first round. They served as alternates in a third Masters in a row at the Italian Open but lost for the fourth time in the first round. At the 2021 ATP Lyon Open, Petros and Stefanos received their sixth wildcard in doubles but lost the first round match.^[4] This was the fifth loss in seven tournaments, in the first round, since the beginning of the year.

The brothers received their second Grand Slam and seventh wildcard for the year at the 2021 Wimbledon Championships, losing in the first round. They also received their eight wildcard at the 2021 Hamburg European Open, losing in the first round.

Tsitsipas at the 2022 Monte-Carlo Masters

The brothers received two more wildcards at the 2022 Monte-Carlo Masters and 2022 Mutua Madrid Open, where they lost in the second and first rounds respectively. They also received their eleventh and twelfth wildcard in Stuttgart and at the 2022 Mallorca Championships where they also lost in the second and first rounds respectively. They entered the 2022 US Open as an alternate pair where they lost in the first round.

The brothers again received a wildcard at the 2023 ABN AMRO Open in Rotterdam, their thirteenth in two years, where they lost in the first round.^[5] Petros Tsitsipas again partnering French Luca Sanchez received his fourteenth wildcard to the main draw of the 2023 Open 13 Provence in Marseille. They received wildcards again, their fourteenth and fifteenth as a team, for the 2023 Monte-Carlo Masters and the 2023 Mutua Madrid Open. It was Petros's 100th wildcard in his career.^[6][7]

He received a wildcard for the 2023 Mallorca Championships with Bart Stevens.^[8] At the 2023 Wimbledon Championships the brothers lost again in the first round to French teenagers Arthur Fils and Luca Van Assche.^[9]

Petros and Stefanos Tsitsipas won their first doubles ATP title in Antwerp, defeating Ariel Behar and Adam Pavlásek in the final.^[10]

Doubles: 1 (1 title)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Oct 2023	European Open, Belgium	250 Series	Hard (i)	Stefanos Tsitsipas	Ariel Behar Adam Pavlásek	6–7(5–7), 6–4, [10–8]

Singles: 1 (0–1)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jul 2021	M25 Ajaccio, France	World Tennis Tour	Hard	Clément Chidekh	3–6, 0–6

Doubles: 17 (10–7)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Aug 2016	Italy F10	Futures	Clay	Stefanos Tsitsipas	Franco Agamenone Mateo Nicolas Martinez	2–6, 2–6
Loss	0–2	Oct 2018	Tunisia F34	Futures	Hard	Duje Ajduković	Bernardo Azevedo Pereira e Oliveira Robert Strombachs	4–6, 7–6(8–6), [6–10]
Loss	0–3	Nov 2018	Greece F8	Futures	Hard	Markos Kalovelonis	Vít Kopřiva David Pichler	2–6, 6–4, [7–10]
Loss	0–4	May 2019	M15 Heraklion, Greece	World Tennis Tour	Hard	Michail Pervolarakis	Lloyd Glasspool Aidan McHugh	6–7(5–7), 6–7(2–7)
Win	1–4	Sep 2020	M15 Monastir, Tunisia	World Tennis Tour	Hard	Aristotelis Thanos	Matías Franco Descotte Thiago Agustín Tirante	6–3, 6–4
Win	2–4	Jul 2021	M25 Kottingbrunn, Austria	World Tennis Tour	Clay	Martins Podzus	David Poljak Alexander Shevchenko	6–3, 6–3
Win	3–4	Aug 2021	M25 Bolzano, Italy	World Tennis Tour	Clay	Victor Vlad Cornea	Marco Bortolotti Daniel Dutra da Silva	6–3, 6–4
Win	4–4	Aug 2021	M15 Oldenzaal, Netherlands	World Tennis Tour	Clay	Constantin Schmitz	Jonathan Binding Mark Whitehouse	7–6(7–4), 6–4
Win	5–4	Aug 2021	Prague, Czech Republic	Challenger	Clay	Victor Vlad Cornea	Martin Krumich Andrew Paulson	6–3, 3–6, [10–8]
Win	6–4	Nov 2021	M25 Saint-Dizier, France	World Tennis Tour	Hard (i)	Alexander Donski	Blake Ellis Tristan Schoolkate	6–4, 4–6, [10–7]
Win	7–4	Nov 2021	M25 Villers-lès-Nancy, France	World Tennis Tour	Hard (i)	Alexander Donski	Blake Ellis Tristan Schoolkate	7–6(7–2), 3–2 ret.
Win	8–4	Mar 2022	M25 Poreč, Croatia	World Tennis Tour	Clay	Aristotelis Thanos	Titouan Droguet Ergi Kırkın	7–6(7–4), 4–6, [10–7]
Win	9–4	Mar 2022	M25 Opatija, Croatia	World Tennis Tour	Clay	Zvonimir Babić	Riccardo Bonadio Michael Vrbenský	6–3, 4–6, [10–8]
Loss	9–5	Oct 2022	Brest, France	Challenger	Hard (i)	Filip Bergevi	Viktor Durasovic Otto Virtanen	4–6, 4–6
Loss	9–6	Nov 2022	Helsinki, Finland	Challenger	Hard (i)	Reese Stalder	Purav Raja Divij Sharan	7–6(7–5), 3–6, [8–10]
Win	10–6	Mar 2023	Antalya, Turkey	Challenger	Clay	Filip Bergevi	Sarp Ağabigün Ergi Kırkın	6–2, 6–4
Loss	10–7	May 2023	Francavilla al Mare, Italy	Challenger	Clay	Sander Arends	Nicolás Barrientos Ariel Behar	6–7(1–7), 6–3, [6–10]