MILAN, March 30 — Napoli’s Champions League hopes were left hanging by a thread after Saturday’s 3-0 home humbling by Atalanta as the outgoing Serie A title holders showed support for Juan Jesus after a racism controversy.

First-half goals from Aleksei Miranchuk and Gianluca Scamacca and a late Teun Koopmeiners strike boosted sixth-placed Atalanta’s chances of a spot in Europe’s top club competition.