The South Bend native and former Notre Dame star scored 32 points in her return to Indiana to help the Tulsa Shock beat the Fever 107-102 in overtime Wednesday night.
Diggins hit a 3-pointer with 2.8 seconds left in regulation to force overtime and complete a 17-point second-half comeback. She also had seven rebounds and four assists.
''They're very aggressive and tough and they make it tough to get to the basket,'' Diggins said. ''I was just finally able to get some things going, get some baskets in transition and some shots finally started falling down.''
Diggins' 3-point play midway through the overtime period gave Tulsa (6-7) a 102-96 advantage.
The Fever cut it to 102-99 on Briann January's 3-pointer with 2:21 left. But a minute later, Diggins set up Odyssey Sims for a layup that put the game away.
With Indiana up 93-91 with 7.8 seconds left in regulation, Zellous missed the first of two free throws. She made the second to push the margin to three, and Diggins tied it with her 3-pointer in front of a large group of family and friends at Bankers Life Fieldhouse.
''We had the game. We just let them take it right from us,'' Zellous said. ''We weren't as aggressive as we should have been and we allowed them to play comfortable.''
Indiana Pacers coach Frank Vogel and players Lance Stephenson and Chris Copeland attended the game.