Emmanuella Edoka added 14 points and 17 rebounds for the Kings.
Erin Koscwiewicz led the Monarchs with 14 points. Jayla Myles had 12 points and 14 boards while Anglina Spampinato scored 11.
Both teams scored 22 points in the first quarter, but Mercy took a 38-30 lead to the half. Kearney took control by winning the third period 17-5 and held on to win.
The Kings are now 11-2 while Mercy dropped to 9-4.