Mestoğlu started playing basketball with Teksüt Bandırma's youth team Bandırma Kırmızı.
He transferred to UCAM Murcia with youth level for 2019–20 season. He played with the club's youth and senior level for three years.
In the 2020–21 season he would alternate his participation in the junior team with the EBA League affiliate, averaging 8 points and 7.2 rebounds per game in his team's permanence phase. With the junior team, he played in the Spanish Club Championship in which he averaged 15.8 points, 7.2 rebounds and a PIR of 19.2.
On 10 August 2021, the player is renewed by UCAM Murcia until 2026.[3] During the 2021–22 season, he is part of UCAM Murcia B of the EBA League. On December 27, 2021, he made his debut in the Liga ACB in a match that would end with a 83–100 victory against CB Gran Canaria,[4] in which Mestoğlu would play 42 seconds in which he would provide an assist.[5][6] He played two match to play for the team in professional level.
He loaned to CP La Roda of LEB Plata for 2022–23 season. He played with 8.4 pts, 3.6 rebs and 1.0 assist average with the team of 25 season game.[7]
He transferred to EuroLeague powerhouse Fenerbahçe Beko for the 2023–24 season. He will also play for Fenerbahçe Beko youth team Fenerbahçe Koleji Novotel.
On 19 January 2024, he made his EuroLeague debut against Žalgiris in an away match (lost 98–75).[8]
On 26 January 2024, he suffered an injury during Fenerbahçe Beko's team training for the Virtus Bologna match in EuroLeague.[9] After the checks, a right knee anterior cruciate ligament tear was detected and surgery was performed on 1 February 2024.[10]
After an eight months rehabilitation period, he was back to court with Fenerbahçe Koleji Novotel and scored nine points against Harem Spor (lost 88–66) on 1 December 2024[11] and scored 17 points against Çağdaş Bodrumspor (won 119–112) on 4 December 2024.[12]
