Ioannis Papapetrou

Papapetrou's professional career began with the Greek League team Olympiacos in 2013, when he signed a 5-year deal with Olympiacos, in late August 2013, which was his first pro deal.[4][5] The contract was said to be worth $2 million net income.[6] The contract included an NBA buyout option after the contract's third season.[7][8]

With Olympiacos, he won the Greek League championship in 2015 and 2016. In 2016, he was named the Greek League Best Young Player.[9]

On July 8, 2018, Papapetrou declined Olympiacos's renewal proposal, and became a free agent. Two days later, he signed with Olympiacos' arch-rivals, Panathinaikos, on a three-year deal.[10] On February 17, 2019, he won his first title with Panathinaikos, after beating PAOK[11] in the 2019 Greek Cup Final, which was held at Heraklion Indoor Sports Arena. Papapetrou had 10 points, 6 rebounds, 2 assists, 2 steals, and 2 blocks in that game. Four months later, Papapetrou was crowned Greek Basket League champion, after Panathinaikos swept Promitheas Patras in the league's finals.[12]

Prior to the 2020–21 season, Papapetrou became the team's captain after the departure of Nick Calathes.

As a member of the Greek junior national teams, Papapetrou played at the 2009 FIBA Europe Under-16 Championship. He also played at the 2010 FIBA Europe Under-16 Championship, where he averaged 11.4 points, 4.6 rebounds, and 2.3 assists, in 32.1 minutes per game.[13] He also played at the 2013 FIBA Europe Under-20 Championship, where he averaged 15.9 points, 5.3 rebounds, and 1.6 assists, in 33.0 minutes per game.[14]

Papapetrou is also a member of the senior men's Greek national basketball team. He was selected to Greece's 12 man roster for the 2016 Turin FIBA World Olympic Qualifying Tournament.[15] He also played at the EuroBasket 2017, and the 2019 FIBA World Cup qualification.