Albert Barnes Commentary Psalms 18:19

"He brought me forth also into a large place; He delivered me, because he delighted in me." — Psalms 18:19 (ASV)

He brought me forth also into a large place – Instead of being hemmed in by enemies and confined in my troubles, so that I seemed to have no room to move, he brought me into a place where I had ample room and where I could act freely. Compare the note at Psalms 4:1.

he delivered me – He rescued me from my enemies and my troubles.

because he delighted in me – He saw that my cause was just, and he had favor toward me.