Athanasios "Thanasi" Kokkinakis (born 10 April 1996) is an Australian professional tennis player. He has been ranked as high as world No. 65 in singles by the ATP achieved on 6 November 2023 and a career-high doubles ranking of No. 15 attained on 21 November 2022 after winning the 2022 Australian Open and reaching the semifinals of the 2022 Miami Open with countryman Nick Kyrgios.
Kokkinakis has also won one ATP Tour title in singles and produced his best Major singles performance by reaching the third rounds at the 2015, 2023, and 2024 French Open.
As a junior, Kokkinakis was ranked as high as No. 10 in the world. He won one junior Grand Slam title, the doubles title at the 2013 Wimbledon Championships with partner Nick Kyrgios, and was the runner-up in two additional junior Grand Slam singles finals that same year. As a professional, Kokkinakis broke into the top 100 for the first time in 2015, during which he won one title on the ATP Challenger Tour and made the fourth round of an ATP Masters 1000 tournament for the first time at the 2015 Indian Wells Masters. After an injury-plagued 2016, he reached his first two ATP Tour finals the next year, when he won the 2017 Brisbane International doubles title with Jordan Thompson but lost at the 2017 Los Cabos Open in singles to Sam Querrey. In 2018, Kokkinakis won two additional Challenger titles and ended the year having re-entered the top 150. However, over the next two years, further injuries prevented him from regularly competing on the professional circuit, but he made his return in 2021 and he reached two Challenger finals, of which he won one. He continued his comeback in 2022 and appeared in his first ATP Tour final in five years at the 2022 Adelaide International 2, in which he prevailed in front of a home-town audience to secure his maiden ATP Tour singles title. He then won the Australian Open doubles title partnering Kyrgios, and the pair competed in the year-end championships.
Personal life Kokkinakis was born in Adelaide to Greek immigrant parents, Trevor (Tryfon) from Perivolia Messinia and Voula (Paraskevi) from Panagali Arcadia.Ο τενίστας Θανάσης Κοκκινάκης με ρίζες από το Παναγάλι Αρκαδίας vlaherna.gr He attended Scotch College throughout his upbringing in Adelaide. While competing on tour for his home country of Australia, Kokkinakis also holds Greek citizenship. His tennis idols growing up were Marat Safin and Roger Federer.
In 2023, Kokkinakis was dating Melbourne influencer Hannah dal Sasso.
He is close friends with Nick Kyrgios, with whom he won the 2022 Australian Open doubles title. The pair also competed at the US Open and at the 2022 ATP Finals.
Kokkinakis made his media debut as a commentator on the Australian broadcast of the French Open in May 2025.
Career 2008–2010: Junior career As a junior, Kokkinakis had a breakthrough when in March 2008 he won the 12 year old National Lawn Tennis tournament in Mildura beating Joshua Bray 6–1, 6–2 in the final. This was a big stepping stone after being beaten in the previous 12 year old National Hardcourt Tennis Tournament in January 2008 by Lochlan Greene in straight sets in the round of 16. This tournament was won by Nick Kyrgios. In 2009, Kokkinakis was selected with fellow Australian tennis representatives James Ma, Li Tu and Daniel Talens, on a Tennis Australian European tour. He has said that this tour changed the course of his career.
Kokkinakis received a wildcard into the 2013 Australian Open juniors tournament and eventually reached the final taking down the 12th, 2nd and 11th seeds on his way. In the final he faced fellow Australian Nick Kyrgios. After having two set points in the first set he eventually lost 7–6(7–4), 6–3.
In June, he returned to competitive play at Wimbledon, and made the third round in the boys' singles and won the boys' doubles with Nick Kyrgios.
Kokkinakis lost the final of US Open Boys' Singles, losing in three sets against Borna Ćorić, 6–3, 3–6, 1–6. Following the result, Kokkinakis reached a career high junior ranking of 10.
Despite still being eligible, Kokkinakis elected not to play junior events in 2014 and instead focused on the men's tour.
2011–2013: Professional career debut
Kokkinakis began his professional career in March 2011 at the Australia F3 Future's event at the age of 14 where he lost 6–8 in the third set tiebreak to Leon Frost. He recorded his first professional win the following week against Kento Takeuchi at the Australia F4 event. He then lost in the second round to Michael Venus.
In 2012, after playing Futures events in Australia, Slovenia, Germany and the Netherlands, Kokkinakis equaled his best result of the year by reaching the semifinals of the Belgium F4 event. He then returned to play Futures in Australia where he reached back to back quarterfinals in the F5 and F6 events, losing to Luke Saville both times. He finished the year by reaching the semifinals at the Australia F12 event where he lost to Ben Mitchell.
He began 2013 by filling-in on the United States and German teams during the 2013 Hopman Cup as a replacement for injured John Isner and Tommy Haas. Kokkinakis competed in the qualifying competition of the 2013 Australian Open, losing to Steve Johnson 15–17 in the third set. Kokkinakis sustained a stress fracture in his back in the Australian Open boys' final which kept him out of competition until mid 2013. He then returned to competition playing Futures tournaments in the Czech Republic, Canada and the United States with the highlight being a quarterfinal of the Canada F5 event. In September and October, Kokkinakis competed in two Challenger events in the United States. The first was the 2013 Napa Valley Challenger where he qualified and reached the second round, going down to Bradley Klahn despite leading by a set. Then in the 2013 Sacramento Challenger he qualified and made the second round. He again lost despite leading by a set against Nick Kyrgios. As a result of this, his ranking increased to a career best of number 655. In October, Kokkinakis paired up with Benjamin Mitchell and won the Melbourne Challenger defeating Alex Bolt and Andrew Whittington in the final in straight sets. This increased his doubles ranking by 453 places, which put him up to a career high of number 505. He also reached the second round in the singles. He looked like he would cause a big upset after taking the first set against Matt Ebden before losing the next two sets. He finished his year at the 2013 Traralgon Challenger where he lost in the second round to James Duckworth in straight sets.
Despite missing half of the year due to injury, Kokkinakis finished 2013 with a ranking of No. 627.
2014–2015: Breakthrough to top 100 Kokkinakis began 2014 in qualifying at the 2014 Brisbane International after receiving a wildcard. He qualified and drew fellow Australian and eventual tournament champion Lleyton Hewitt in round one where he went down in straight sets. Kokkinakis was awarded a wildcard into the 2014 Australian Open where he defeated Igor Sijsling in the first round in four sets despite suffering from cramp. He was defeated in the second round by top seed and world No. 1, Rafael Nadal.
Kokkinakis reached the semifinals of the 2014 Heilbronner Neckarcup coming through the qualifying and beating Jesse Huta Galung, Michael Russell and Marsel İlhan. He then lost to top seed Jan-Lennard Struff and missed out on a place in his first ATP Challenger Tour final. Kokkinakis received a wildcard in the French Open qualifying rounds, where he made the final, and despite having match point in the third set, he lost to Ante Pavić, 6–4, 6–7, 5–7. This result improved his ranking inside the top 300 for the first time. Kokkinakis won his first singles title in Canada on 13 July, defeating Fritz Wolmarans in the final. Kokkinakis then qualified for the 2014 Shenzhen Open. He beat Egor Gerasimov before he got beaten in the second round by sixth seed Santiago Giraldo 6–4, 6–3. Kokkinakis qualified for his second career Masters 1000 in Shanghai, but lost to Feliciano López in the first round 7–6, 3–6, 4–6.
Kokkinakis finished 2014 with a ranking of No. 150.
Kokkinakis began 2015 at the Brisbane International where he received a wildcard into the main draw. In the first round he defeated eighth seed Julien Benneteau in straight sets. He lost in the second round against compatriot Bernard Tomic. Kokkinakis and Grigor Dimitrov were also awarded a wildcard into the doubles event. They reached the semifinals, where they lost to Kei Nishikori and Alexandr Dolgopolov.
Kokkinakis received a wildcard also into the 2015 Australian Open, where he defeated 11th seed Ernests Gulbis in the first round, and then lost to compatriot Sam Groth in five sets in round 2. In February, Kokkinakis qualified for three ATP World Tour events; Memphis, Delray and Mexican Open. In March, Kokkinakis played his first live rubber at the Davis Cup. He defeated Czech, Lukáš Rosol in five sets. He was awarded a wildcard into the Indian Wells Open where he defeated Struff, Guillermo García López and Juan Mónaco before losing to Bernard Tomic in the fourth round. Next, he competed in the Miami Open, where he lost in the first round to Carlos Berlocq. Following, he competed in Istanbul Open where he completed three rounds of qualifying, but losing in the round of 32 to Dušan Lajović 6–4, 7–5. Following Istanbul, he qualified for the Madrid Open, and he fell in the first round to Sam Querrey in three sets, however, this improved his ranking and broke him into the top 100 for the first time. He won the Challenger BNP Paribas Primrose (Bordeaux) defeating Thiemo de Bakker, then got a wildcard into the French Open, where he defeated Nikoloz Basilashvili and 27th seed Bernard Tomic in the second round before losing to eventual finalist and world No. 1, Novak Djokovic.
Kokkinakis began his grass court season at the Queen's Club Championships after being awarded a last minute wildcard following the withdrawal of Kyle Edmund. In his opening match he beat Jérémy Chardy, but lost in the second round to Gilles Simon. Kokkinakis was defeated in round 1 of Wimbledon against 24th seed Leonardo Mayer. He also contested the Men's doubles with Lleyton Hewitt and the pair reached the third round before losing to eventual champions Rojer/Tecău. Kokkinakis then played for Australia at the Davis Cup quarterfinals where he lost to Mikhail Kukushkin in straight sets. He was then replaced in the reverse singles by Lleyton Hewitt who secured Australia a spot in the semifinals.
On 12 August 2015, Nick Kyrgios revealed that Kokkinakis had previously slept with Donna Vekić, alleged girlfriend of Stan Wawrinka, while playing Wawrinka at the Montreal Masters. Kokkinakis later responded to Kyrgios's comments, saying "I let him know. I made it pretty clear that he can't be doing that. If he's got a problem, he's got to say it in private. The way he went about it definitely wasn't the right thing." In his first match after the incident, he was involved in an altercation with American Ryan Harrison during their qualifying match at the Cincinnati Masters, with one report alleging that Harrison threatened physical violence against Kokkinakis and insulted his crew.
Kokkinakis finished, 2015, with a ranking of 80.
2016: First injury-plagued year