Athanasios "Thanasi" Kokkinakis (/θəˈnɑːsi ˌkɒkɪˈnɑːkɪs/ thə-NAH-see KOK-in-AH-kiss;[3] Greek: Αθανάσιος "Θανάση" Κοκκινάκης; born 10 April 1996) is an Australian professional tennis player.

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.

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.

Kokkinakis was born in Adelaide to Greek immigrant parents, Trevor (Tryfon) from Perivolia Messinia and Voula (Paraskevi) from Panagali Arcadia.

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.

[9] 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.

[citation needed] 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 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.

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.

[15][16] Kokkinakis was awarded a wildcard into the 2014 Australian Open[17] where he defeated Igor Sijsling in the first round in four sets despite suffering from cramp.

[19] Kokkinakis reached the semifinals of the 2014 Heilbronner Neckarcup coming through the qualifying and beating Jesse Huta Galung, Michael Russell and Marsel İlhan.

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.

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.

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.

[25] 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.

[29] Kokkinakis later announced his injuries were caused by vanity, as he lifted weights to increase his bicep size especially with the news that Nike was bringing out new sleeveless tops.

Kokkinakis was granted a singles wildcard at the Apia International, where he was scheduled to play Thompson in the first round, but withdrew due to injury.

Using a protective ranking, Kokkinakis played his first singles match since October 2015 at Lyon losing to Denis Istomin in straight sets.

The following week, Kokkinakis received a wildcard into Queen's where he defeated Milos Raonic in his opening match in straight sets to record his first top 10 victory.

[citation needed] In September, Kokkinakis reached the final of the Tiburon Challenger, where he went on to lose to Tommy Paul in three sets.

After failing to qualify for the French Open, Kokkinakis' next event was Nottingham, where he lost in a tight three-set match to defending champion and top seed Dan Evans.

[40] At the second tournament, Kokkinakis bettered his result, beating Benoît Paire, second seed John Isner and fellow Australian wildcard Aleksandar Vukic.

In the doubles at Indian Wells, partnering Kyrgios, he lost to eventual champions John Isner and Jack Sock in the second round.

The following week in Los Cabos, as the seventh seed, Kokkinakis beat Fernando Verdasco in three sets before losing to Steve Johnson in the second round.

Kokkinakis and Kyrgios qualified for the 2022 ATP Finals in Turin as a result of being guaranteed to stay inside the top 20 as a pair and having won the Australian Open.

After receiving a wildcard into the French Open, he beat 20th seed Dan Evans in straight sets to record his biggest win at a Grand Slam since 2015.

In his first tournament in North America at Granby, he beat qualifier Patrick Kypson from a break down in the third set, but retired in the second round against James Trotter.

After the Davis Cup, Kokkinakis' next tournament was Shanghai, where he defeated Fabio Fognini in the first round, but lost once again to Hurkacz, who would go on to win the event, in straight sets.

After Shanghai, Kokkinakis played the Shenzhen Challenger, where he defeated Colin Sinclair in straight sets, but was upset in the second round by Beibit Zhukayev.