India has become the third top source market for visitor arrivals in Singapore, as the nation received 6.1 lakh visitors between January and May this year, a senior official in Singapore Tourist Board said today.The year 2017 was a record for the board as visitor arrivals from India had crossed 1 million for the third time in a row, showcasing the highest growth rate at 16 per cent in comparison with all markets, G B Srithar, Regional Director, South Asia Middle East and Africa International Group of the Board, told reporters here.