Fernandez served as the Kingsā associate coach the last two seasons under his mentor, Sacramento coach Mike Brown.
The Nets' 19-point first-half lead evaporated, but with the score tied at 88-all after three quarters, they held the Kings to 15 points in the fourth.
With the Nets up 107-102, neither team made a field goal in the last two minutes, with the Kings missing their last five attempts.
Thomas had nine points in the fourth.
DeāAaron Fox led the Kings with 31 points.
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