Glendora beat Ayala 21-14 Thursday night to force a three-way tie atop the Sierra League with Chino Hills having defeated Diamond Bar 34-21 across town.
But Ayala won the postgame coin flip to determine the seeding of the three Sierra League co-champions: Ayala (8-2, 4-1), Chino Hills (9-1, 4-1) and Glendora (7-3, 4-1).
Chino Hills will be the second seed and Glendora the third seed. Chino Hills defeated Glendora 31-29 on Oct. 31.
In the Miramonte League championship game Thursday night, Bonita fell to Charter Oak, 48-10, handing Charter Oak its fifth consecutive league title.