#3) Mariners LHP Brandon Williamson
Brandon Williamson is the best left handed pitching prospect in the Mariners organization, and he has been very underrated. Williamson was drafted in 2019 out of TCU in the second round. The first round pick that year was George Kirby, and that cast a shadow on Williamson from the start. He was considered an okay lefty pitcher, but in 2021 he started to break out.
In 2021, the 6’6″ left hander had a 3.39 ERA, 153 strikeouts, and only 33 walks in 98.1 innings in high A and AA. He looked great, dominating hitters with his mid 90s fastball that can reach the high 90s, and big bending curveball. He looked like a great starting pitcher, but he was doing this against some weaker competition. He now looks like a legit mid rotation arm for the Mariners, and he could be there very soon.
It is very possible that Brandon Williamson is the first of the M’s pitching prospects called up in 2022 to make his debut. He looks very similar to former Mariner James Paxton, and I believe that Williamson can be exactly what Paxton was supposed to be. He can be a strong number 3 starter with a good combination of pitches. He should be a strong factor the Mariners in 2022 and beyond.