Diana Taurasi is rounding into shape and Phoenix doesn't lack for talent. So I wouldn't be surprised if the Mercury make a move starting with this game. 
LA is fat and happy right now. Derek Fisher is my least favorite coach in this league. 
Phoenix outscores LA on the season and has a strong inside presence with Britney Griner. 
The Mercury also is coming off their first two-day break since having three days in between their first and second games of the season. That extra day of rest should help them mentally and physically.
The Sparks last played this past Saturday. That's too long of a break so they could be rusty.