The Sif vs. SlackerNinja battle in Super Smash Bros. Ultimate took place on Jan 17, 2020 as a part of the Glitch 8 Singles tournament. This confrontation belongs to the Bracket E14.
The results of the confrontation are as follows:
Jan 17, 2020: Sif 2 - 1 SlackerNinja
The Sif vs. SlackerNinja — Jan 17, 2020 battle recording stream you can watch in the VODs section