India's win was made all the more remarkable by the omission of Ravichandran Ashwin, yet to feature in this series, despite the off-spinner's haul of 413 Test wickets
It was just India's second Test match win at the Oval, coming 50 years after a four-wicket triumph at the south London ground gave them a first such success on English soil
A surge in recent days has seen patients' families taking to social media to beg for oxygen supplies and locations of available hospital beds, and has forced the capital New Delhi to extend a week-long lockdown.
England, trailing 2-1 in the series, need another 70 to make India bat again but face another quick loss after their two-day humiliation in the third Test at the same venue.
Off-spinner Dom Bess looks likely to earn a recall after two games on the sidelines. The 23-year-old was initially dropped for Moeen Ali, only to be overlooked again when he flew back home.
"Only if we back them in such a way that they can improve, they will improve faster. But if you are going to find those loopholes and faults, cricketers are going to take that much longer.
Left-hander Sundar, who made his debut in the fourth Test of India's historic win in Australia last month, raised his second successive Test fifty with a boundary off Leach.