Total line is 181.5 - this is like a line of a regular NBA game between two low scoring teams (e.g. Memphis Grizzlies, Utah Jazz).
Nonetheless the Mystics and the Aces have gone 190+ in the past few games, the lines were around the 170ish e.g. 176 last time.
Still, it's WNBA, I know these are the two best scoring teams in the league - if you had to choose would you take the OVER or the UNDER 181.5 in this one?