Brynn Martinez begins his second professional season and first with the ThunderBolts in 2019. He was acquired in the second round of the 2019 Frontier League draft. His career began with 31 games in the United Shore League in 2018. He hit .218 in 31 games for Utica. Martinez played collegiately at Quincy University, where he hit .320 over four seasons with 61 stolen bases. He hit .361 as a senior in 2018, whacked six home runs and stole 27 bases. He left Quincy as the Hawks' all-time leader in hits (274) and runs scored (223). He was named All-GLVC four times and All-Region twice.