Double-A Jackson was defeated by Mobile, 1-0, on Friday to end their season with a 3-1 series loss in the Southern League Championships.
Catcher Mike Zunino, Seattle's first-round Draft pick, went 1-for-4 in the finale and finished the postseason hitting .379 in eight games, with three home runs and eight RBIs.
Michael Saunders hit his 15th home run on Friday. With 19 stolen bases already in the bag, he became the first Mariners player with 15 homers and 15 steals in a season since Franklin Gutierrez in 2009.
Going into Saturday's game, Kyle Seager was two steals shy of the 15-15 club, with 13 stolen bases and 18 home runs. The last time Seattle had two 15-15 players was in 2003 with Bret Boone (35 homers, 16 stolen bases) and Mike Cameron (18 homers, 17 steals).