During his time at Triple-A, Roa relied on a sinker-slider combination, with the former accounting for 39.7% of his pitches and averaging 95.6 mph. He used the slider 31.2% of the time, while his 96.0 mph four-seamer was his third-most used pitch at 21.1%. Across 60 1/3 innings over 50 appearances, Roa posted a 2.83 ERA with a solid 26.1% strikeout rate.