The teams meet in the series finale at 1 p.m. Sunday. The game can be heard on WWL, with pregame coverage starting at 12:30 p.m.
Saturday's performance marked the first-two homer game of Katz's career, as he helped LSU extend its win streak to nine games.
Katz went 2-for-3 on the night and recorded five RBI in a game for the second time this season.
The Tigers drew a season-high 10 walks in the contest.
LSU starter Ryan Eades (3-0) earned the victory giving up four runs and striking out six in 6.2 innings of work.
Washington starter Austin Voth (2-2) suffered the loss as he surrendered six earned runs on seven hits in 3.1 innings with five walks and three strikeouts.