He was loaned for the 2013–14 season to the Turkish 2nd-tier-level TB2L team Pertevniyal, which was at the time the farm club of Anadolu Efes.

[7] In the BCL, he reached the championship game of the competition with Banvit, where his team lost 63–59 to Iberostar Tenerife.

[10] In Philadelphia's first game of the 2018 NBA Summer League, Korkmaz scored 40 points (including 8 three-pointers) in 28 minutes during an 89–95 loss to the Boston Celtics.

However, he ultimately stayed with the team[13] On December 10, Korkmaz scored 18 points off the bench in a win over the Detroit Pistons.

[14][15] Throughout the season, he had made his way in and out the starting lineup, playing both shooting guard and small forward.

In the playoffs, Korkmaz made four starts in the 2021 Eastern Conference semifinals against the Atlanta Hawks when Danny Green was injured, ending his season.

[19] On February 8, 2024, Korkmaz was traded to the Indiana Pacers in a three-team deal involving the Philadelphia 76ers[20] and was waived the next day.

[22] In October 2024, Korkmaz suffered a slight tear in the right adductor and was expected to miss three to four weeks of action.

[26] Korkmaz played with the senior men's Turkish national basketball team at the EuroBasket 2015, and at the 2016 Manila FIBA World Olympic Qualifying Tournament.