Making his 23rd birthday memorable, Shubankar hit six birdies, three of them on last six holes, including the dangerous 16th, also called 'Calamity'.
The US Open golf championship, which was set for June 18-21 at Winged Foot in New York, has been rescheduled due to the novel coronavirus outbreak, the US Golf Association said on Monday. The new dates for the year's third major are September 17-20 also at Winged Foot.
Shubhankar got the real taste of Northern Ireland's wet and windy weather as he went out to practice on Wednesday.
McIlroy was tipped as one of the favourites for the first Open in Northern Ireland since 1951 but now faces a battle to get back amongst the leaders.
Ajinkya Rahane scored his seventh Test hundred to help India take a huge first innings lead before rain forced play to be called off early on day three of the second Test against the West Indies, in Jamaica, on Monday.