|Wilki Morskie Szczecin|
|Born||22 August 1994|
|Listed height||6 ft 4 in (1.93 m)|
|NBA draft||2016 / Undrafted|
|2013–2014||→ Kvarner 2010|
|2017–2018||Miasto Szkła Krosno|
|2019–present||Wilki Morskie Szczecin|
|Career highlights and awards|
Mustapić played for the youth selections for his hometown club Cedevita. He started his professional career in the same club, but was loaned twice: once to Zabok and once to Kvarner 2010. After the second loan his contract with Cedevita was terminated and he spent the next three seasons playing in the Croatian League for Split, Jolly and Vrijednosnice Osijek. The 2017–18 season he spent for the first time abroad in Miasto Szkła Krosno of the Polish League.
He is the son of Ivan Mustapić, Croatian record-holding javelin thrower and the nephew of Tihomir Mustapić, a basketball player, but also a javelin thrower that holds the second best Croatian result. Tihomir went on to be an assistant coach at Zrinjski Mostar. His other uncle is Dragan Mustapić, a former discus thrower.
- "Bogdanović mi je rekao: Slobodno pucaj kad si sam" (in Croatian). vecernji.hr. 12 July 2018. Retrieved 16 November 2018.
- "Prometno je u Cedeviti, stigao i Jakov Mustapić" (in Croatian). basketball.hr. 10 November 2018. Retrieved 16 November 2018.
- "Mustapić zawodnikiem Kinga" (in Polish). PLK.pl. June 21, 2019. Retrieved June 24, 2019.
- "Tko sruši moj rekord, dobit će od mene automobil" (in Croatian). vecernji.hr. 23 October 2017. Retrieved 16 November 2018.