St. Louis Cardinals calling up Tyler O'Neill for Major League debut
Mariners Extend Marco Gonzales - MLB Trade Rumors
Salk: 10 options for the Mariners to complete their outfield - Seattle Sports
Mariners sign pitcher Marco Gonzales to four-year extension
Mariners Acquire LHP Marco Gonzales from St. Louis, by Mariners PR
Cardinals acquire Tyler O'Neill from Mariners
Mariners send Canadian prospect O'Neill to Cardinals for Gonzales
Cardinals acquire Tyler O'Neill from Mariners
Mariners, Cardinals swap Tyler O'Neill for Marco Gonzales - MLB Daily Dish
Seattle Mariners, St. Louis Cardinals swap Tyler O'Neill, Marco Gonzales
Cardinals 2020 breakout candidate: Tyler O'Neill - The Athletic