Carlos Alcaraz dispatched Andrey Rublev 6-3, 7-6 (10/8) in impressive fashion to revive his ATP Finals hopes.
Lionel Messi has been in absolute sublime form in the MLS.
Nagal lost 4-6 2-6 to the Croatian Coric in one hour and 10 minutes, as the top ranked Indian player dropped serve four times in the fixture.
Coming off the bench in the 57th minute, Chhetri bagged a brace to become the joint-highest goal-scorer in the ISL, level with Bartholomew Ogbeche on 63 goals.
The 38-year-old legend, set to retire from professional tennis after the tournament, was picked by captain David Ferrer to face Botic van de Zandschulp in Malaga.