[1] Mario Delaš made his professional debut in KK Split, during the 2006–07 season.

[10] After spending a month and playing only four games for Split, in January 2020, Delaš moved to XL Extralight Montegranaro of the Italian second-tier Serie A2.

[12] In August, 2021, Delaš signed with Gipuzkoa of the Spanish second-tier LEB Oro.

[13] After spending a season in the Spanish third-tier Club Melilla Baloncesto where he averaged only 1.9ppg and 2.6rpg, in August 2024 Delaš joined Ribola Kaštela of the Croatian second-tier First Men's Basketball League.

He was selected to the All-Tournament Teams of both championships, and also won the MVP award in the latter tournament, averaging 20 points per game.