The Gamecocks also fell 9-1 to host Mississippi State. JSU, which is 3-1 in the tournament, will wrap up play Sunday with another game against MSU.
Against Mississippi Valley State, JSU belted five home runs to claim its second mercy-rule win over the Delta Devilettes in as many days.
Senior Kalee Tabor homered twice and sophomore Cadi Oliver was a triple shy of the cycle in leading the 16-hit attack for JSU. Sloan's opening homer sparked a three-run first inning that put the Gamecocks up for good.
In the four games in tournament, the Gamecocks have scored in the first inning of each game and have outscored their opponents 13-2 in the first inning alone.
They got three more in the second on back-to-back homers from junior Sara Borders and Tabor, before an eight-run third that was capped by Oliver's two-run blast put them up 14-2.
Oliver drove in three and scored three more in a 3-for-4 game. Oliver was 4-for-6 on the day.
In the opener against MSU, JSU's Tiffany Harbin allowed only a run through four innings before the Bulldogs broke out to score seven times in the fifth.
Sophomore Ella Denes' leadoff homer got the Gamecocks on the board just three pitches into the game, but MSU's Allison Owen settled in and allowed only two more hits the rest of the way. She struck out 10 and didn't walk a batter.
The bottom of the fourth was when the Bulldogs finally got one across of Harbin. On her 81st pitch of the game and her 145th pitch of the season, Caroline Seitz lifted a 3-2 pitch over the wall after fouling off three two-strike pitches. The first run off of JSU in 2014 came after 13 shutout innings to start the year and tied the game at 1-1.
JSU couldn't take advantage of a Cadi Oliver leadoff single in the top of the fifth, but MSU capitalized on a leadoff hit better in the bottom. After Harbin hit Kayla Winkfield, a fielder's choice and a walk to Logan Foulks loaded the bases and set up Sam Lenahan's two-run double. The gapper to right center made it a 3-1, and MSU never trailed again.