Despite having been chosen all the way down in the 24th round of the 2016 draft, Smith had an impressive debut for the Diamondbacks after getting called up in late August 2020. He allowed three earned runs over 18.1 innings in long relief, striking out almost a hitter per frame. That included five scoreless innings against Texas, with seven strikeouts. He was ranked #16 in our 2020 reviews, and Michael wrote, "Producing soft contact is going to be critical for Smith to stay in the big leagues due to the lack of swing and miss stuff, so we’re hoping this is the trend.