In a rain-plagued weekend of play, LSU (44-18) moved on to face the winner of Rice and Southeastern Louisiana at 7 p.m. The Owls and Lions square off at 2 p.m.
In the bottom of the first inning, Deichmann hit what looked to be a bases-clearing double down the right field line. However, when the ball went under the bullpen bench, Rice right fielder Charlie Warren attempted to retrieve the ball unsuccessfully. When he came to his feet without the ball and tried to call for time, Deichmann had rounded third and scored.
After a brief meeting about the ground rules, the umpires ruled the play an inside-the-park grand slam that gave LSU a 4-0 lead.
Regardless of the ruling some deemed controversial, a single by Chris Reid two batters later would have given the Tigers the same advantage.
Meanwhile, Lange improved to 4-0 in NCAA postseason play with another brilliant outing. He pitched into the ninth inning - despite a 56-minute rain delay in the top of the sixth - allowing only two runs on five hits with a pair of walks and 10 strikeouts.
Hunter Newman entered after a lead off single in the ninth inning and recorded his seventh save of the season.