Report: M's, Gonzales agree to 2-year, $1.9 million deal
Who is Tyler O'Neill? - Viva El Birdos
Mariners send top prospect O'Neill to Cardinals for Gonzales - The Columbian
Trade analysis: Mariners deal a top prospect in Tyler O'Neill but leave their biggest hole unfilled
O'Neil: Mariners taking a different approach to find value in starting pitchers - Seattle Sports
Viva El Birdos Cardinals 2018 Prospect Rankings: #4 Tyler O'Neill - Viva El Birdos
Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill
Seattle Mariners, St. Louis Cardinals swap Tyler O'Neill, Marco Gonzales
Detroit Tigers trade target: Tyler O'Neill
Mariners Flip Tyler O'Neil for Marco Gonzales: Yawn or Yay?
Cardinals acquire Mariners top prospect Tyler O'Neill for Marco Gonzales