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ATK managed to maintain their slender lead to hand Chennaiyin FC their fourth defeat of the season and climbed to the fourth spot on the table.
ATK slumped to their third loss of the season and find themselves placed fifth with seven points from six matches.
Manuel Lanzarote's willingness to drop deep in midfield allowed ATK to hold on to the ball better as the second-half progressed.
Balwant Singh scored in the 20th minute as he curved the ball in from the left beyond Delhi custodian Dorronsoro's reach.
The change was necessitated due to Karnataka state government's requirement of Sree Kanteerava Stadium ground in preparation for Kannada Day.
ATK, placed sixth on the points table, have won just one of their four fixtures so far while Chennaiyin, languishing at the ninth spot, have got just one point after playing four games.
Having suffered back-to-back defeats at home to start their campaign, the new-look ATK have managed to bounce back with two wins and draw.
Chennaiyin had lost to ATK 1-2 in the away game and will be eager to get back to level terms.
Matej Poplatnik and Slavisia Stojanovic scored in the second half as Kerala scored only their second win over the Kolkata franchise, and first since the 2014 edition.
At present, Mumbai are on the third spot in the standings with four wins, one draw and two losses.
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