Jonquel Jones scored 27 points, and Courtney Williams added 25, helping the Connecticut Sun rout the visiting Los Angeles Sparks, 94-68, on Thursday night and take a two-games-to-none lead in the W.N.B.A. semifinals.

The Sun led by 1 point at the half before Williams blew the game open. She scored 13 of her points in the third quarter.

Connecticut led by 70-57 after three quarters and scored 10 of the first 12 points in the fourth, dashing any hopes Los Angeles had of a comeback. Sparks Coach Derek Fisher pulled his starters with 5 minutes 31 seconds left and his team down by 23 points.

Nneka Ogwumike scored 18 points and Riquna Williams 14 for the Sparks, who will have to win three straight games to make the finals for a third time in five years.