Getting to Know: Marco Gonzales, by Mariners PR
St. Louis Cardinals: Cardinals trade Mike Leake to the Mariners
Marco Gonzales Trades and Transactions by Baseball Almanac
Mariners sign pitcher Marco Gonzales to four-year extension
Seattle Mariners send top prospect Tyler O'Neill to St. Louis Cardinals for Marco Gonzales - ESPN
Slugger, know thyself: O'Neill's strong start began by reconnecting with 'player I am, waiting to break out
Baseball Twitter intrigued by possible trade talks between Seattle Mariners and St. Louis Cardinals: Watch this space Oh man here we go
Cardinals fans embarrassed by old Tweets about O'Neill trade
Mariners sign Marco Gonzales to four-year, $30 million extension with club option for 2025 - MLB Daily Dish
Trade analysis: Mariners deal a top prospect in Tyler O'Neill but leave their biggest hole unfilled