In 2024, he turned pro after joining the Iloilo United Royals of the Maharlika Pilipinas Basketball League (MPBL) before getting drafted by and signed with Terrafirma later that year, Mark Nonoy first played for the UST's high school team, the Tiger Cubs, in 2018.
[1][2] Upon graduation from high school, he joined the UST Growling Tigers college team for the 2019 season.
[6] On January 28, 2024, Nonoy entered the pro scene upon joining the Iloilo United Royals of the Maharlika Pilipinas Basketball League.
[7] Mid-season, during the PBA season 49 draft, Nonoy was selected with the 10th overall pick by the Terrafirma Dyip,[3] but due to his contractual commitments with Iloilo, he wasn't able to sign for the team immediately.
[8] On October 17, 2024, with his lone season in the MPBL finished, Nonoy signed with Terrafirma under a two-year deal.