Mariners send Canadian O'Neill to Cards for Gonzales
Mariners, Cardinals swap Tyler O'Neill for Marco Gonzales - MLB Daily Dish
The Mariners and Cardinals make a minor trade - NBC Sports
Cardinals To Promote Tyler O'Neill - MLB Trade Rumors
Trade analysis: Mariners deal a top prospect in Tyler O'Neill but leave their biggest hole unfilled
As 2021 finishes up who won the Marco Gonzales for Tyler O'Neill trade?
Mariners Extend Marco Gonzales - MLB Trade Rumors
Cardinals acquire Mariners top prospect Tyler O'Neill for Marco Gonzales
MLB Trade Deadline Recap: St. Louis Cardinals - MLB Daily Dish
Mariners Trade Tyler O'Neill to Cardinals for Marco Gonzales - Lookout Landing
Tyler O'Neill - Wikipedia
The Trade That Saved the Seattle Mariners - The Ringer