In a 7-7 game, Brandon Riley drew a walk to begin the Cardinals’ ninth. Two batters later, Jackson deposited a line drive over the right-field wall.
Johnson City, which scored in every inning but the second and eighth, were down 7-4 heading into the seventh. After Nolan Gorman led off with a line-out to center, the Cards put three runners on base without the benefit of a base hit.
Leandro Cedeno was plunked by a pitch before Carlos Soto Jr. and Riley walked, then Cedeno came home on a passed ball. Andrew Warner then delivered an RBI single, Jackson followed up with a run-scoring double and the teams were deadlocked on the scoreboard.
Harvesting leads of 1-0, 2-1 and 3-2, the Cards fell behind 5-3 when the Reds pushed across three fifth-inning runs.
The two teams combined for 21 hits, with Johnson City totaling 11. Soto was 2 for 4 while Jackson (3 RBIs) and Warner (2) each batted 2 for 5. Gorman and Warner clubbed solo homers.
Going 1 for 2, Riley walked three times, scored twice and knocked in a run. Cedeno went 1 for 2 with two runs.
Rylan Thomas topped Greeneville’s attack with a 2-for-4 effort that included two doubles and three RBIs. Mike Siani (2 runs) and Reniel Ozuna also batted 2 for 4.
Jacob Sylvester (2-1) closed with 2 1/3 shutout innings to garner the victory.