![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://www.usatoday.com/gcdn/-mm-/95f3861d067552d060aeba0d2b63e2cedaf8df11/c=0-100-2288-3151/local/-/media/2017/07/21/USATODAY/USATODAY/636362416413651582-USATSI-9930485.jpg)
Cardinals acquire Mariners top prospect Tyler O'Neill for Marco
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](http://res.cloudinary.com/ybmedia/image/upload/c_crop,h_1332,w_2000,x_0,y_9/c_fill,f_auto,h_1200,q_auto,w_1600/v1/m/3/e/3eaf45a99ed5c18d51acf11696499416b80c6e7a/13373272.jpg)
With Marco Gonzales, an unpopular trade is paying off in Seattle
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://s.hdnux.com/photos/01/04/60/51/18025082/4/rawImage.jpg)
Mariners sign pitcher Marco Gonzales to four-year extension
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://s.hdnux.com/photos/01/04/60/51/18025061/4/1200x0.jpg)
Mariners sign pitcher Marco Gonzales to four-year extension
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://www.thenewstribune.com/latest-news/ahbfq4/picture260473457/alternates/FREE_1140/220415%20pc%20bsb%20sea%20hou_1452.jpg)
Marco Gonzales pitches gem in Seattle Mariners' home opener
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://cdn.vox-cdn.com/thumbor/WsVh4Sw30vLkC_12SqwBDSeE4WU=/0x0:2000x3000/1200x800/filters:focal(388x478:708x798)/cdn.vox-cdn.com/uploads/chorus_image/image/55825077/695735358.0.jpg)
Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://cdn.mlbtraderumors.com/files/2020/05/marco-gonzales.jpg)
An Unpopular Trade Paying Off In Seattle - MLB Trade Rumors
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://images.seattletimes.com/wp-content/uploads/2019/07/191302.jpg?d=1560x1040)
Tyler O'Neill's return to Seattle offers opportunity to reevaluate
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://images2.minutemediacdn.com/image/upload/c_fill,w_720,ar_16:9,f_auto,q_auto,g_auto/shape/cover/sport/https-3A-2F-2Fredbirdrants-com-2Fwp-content-2Fuploads-2Fgetty-images-2F2018-2F05-2F961165278-850x560-ef65309e61c8dbb8c33d59fdd7eec201.jpg)
St. Louis Cardinals: Looking at the trade for Tyler O'Neill
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://www.bnd.com/latest-news/611scw/picture239984328/alternates/FREE_1140/AP19244827443326.jpg)
St Louis Cardinals must get OF Tyler O'Neill into lineup
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://images.spot.im/v1/production/s6zjfs2wuvzw9wmfmwbk)
Revisiting the St. Louis Cardinals trade for Tyler O'Neil
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://images2.minutemediacdn.com/image/upload/c_crop,w_5025,h_2826,x_0,y_0/c_fill,w_1440,ar_16:9,f_auto,q_auto,g_auto/images/ImagnImages/mmsport/33/01gxj2w79mmhx46gcjea.jpg)
5 trade destinations if the St. Louis Cardinals decide to trade
![Cardinals trade Marco Gonzales to Mariners for Tyler O'Neill](https://bloximages.newyork1.vip.townnews.com/gonzagabulletin.com/content/tncms/assets/v3/editorial/7/23/723ce5a2-6564-11e4-934b-0017a43b2370/545aea4322026.image.jpg)
He left GU as a first-round pick. Four years later he's pitching