MasterChef reclaimed the top spot in all key demographics overnight, drawing in an audience of 804,000 viewers, despite recording lower ratings than the night before.
The reality cooking program, which aired its first immunity challenge last night, was without its Nine rival The Voice, which had previously held the top spot since Sunday night.
Nine instead came in second, with the premiere of its two part lifestyle series Eat Well For Less.
The show, hosted by Leila McKinnon , drew in an audience of 614,000, beating Seven's House Rules which slumped below 600,000 viewers.
Ten also aired the season premiere of investment reality program Shark Tank, which drew in an audience of 508,000 following MasterChef.
Seven still edged out Nine for the win in main channel share, taking a 17.8% ovenight share compared to Nine's 17.7%.
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