19-year-old Chadha, who in Mar won the Faldo Series Asia Grand Final, was four shots off the leader Chieh-Po Lee (65) of Chinese Taipei at the A'famosa Golf Resort, while second place was occupied by Jobim Carlos on a day when play was delayed by the threat of lightning.
India was tied fifth in the team event. While Chadha shot 69, Khalin Joshi carded a 75 to give the Indian duo a total of 144.
The Chinese Taipei pair of Chieh-Po and Wei-Hou Liu were at 140.Thailand (141), Australia and Philippines (143) were all ahead of the Indians, who are tied at fifth along with Singapore.
Chadha had a bogey on the third, but he quickly made up with birdies on fourth and eighth to turn in one-under 35. On the back nine, he birdied the 13th and 14th to finish in 69 on the day.
71-year-old Angad Cheema is tied sixth. But other Indians in Amanjyot Singh and Gagan Verma are way down in the event, where a total of 96 players from more than a dozen countries are taking part.
Leader Chieh-Po had birdies at the third and fifth holes before shooting an eagle three at the 507-metre, par-five, seventh hole to make the turn on four-under-par 32. He went on to make five more birdies at holes 10, 11, 12, 16 and 17 against two bogeys.
The women's competition will begin from Friday, May 20.