Becky Hammon scored 14 points in the fourth quarter to carry host San Antonio.
The Stars won the fourth quarter 28-20. In five wins, the Mercury have won four fourth quarters plus one overtime by a combined score of 118-69. In three losses, the Mercury have lost the fourth quarters.
Belinda Snell had a career-high 21 plus 4 steals to lead San Antonio.
It was San Antonio’s first win against the spread; the Spurs were 3-point dogs. The highest-scoring team in the league, Phoenix made their sixth over in eight games.