Prospects in the Mariners' 2020 player pool
Kyle Lewis, Cal Raleigh still hot, Ricardo Sanchez, Ljay Newsome sharp: Mariners Prospect Wrap — July 8, 2019
Seattle Mariners 2019 Midseason Top 50 Prospects
Mariners to call up Kyle Lewis, Justin Dunn, Donnie Walton, and Art Warren from Double-A Arkansas - Lookout Landing
Looking into the future: The Mariners are expected to promote four prospects from Class AA Arkansas
Seattle Mariners 2019 Top 30 MLB Prospects Midseason Update — College Baseball, MLB Draft, Prospects - Baseball America
Mariners minor-league preview: Trades infuse system with much-needed talent - The Athletic
Mariners Top 50 Prospects: Nos. 6-10
Mariners Select Justin Dunn, Kyle Lewis, Donnie Walton and Art Warren from AA Arkansas, by Mariners PR