India won a record ninth Test series in succession Wednesday after drawing the pollution-tainted third and final Test with Sri Lanka in New Delhi.
Top-ranked India won the series 1-0 to equal Australia's record of nine successive Test series victories, between 2005-2008.
The first Test between India and Sri Lanka in Kolkata had ended in a draw and the hosts won the second game by an innings and 239 runs.
But Sri Lanka salvaged some pride in the final match thanks to Dhananjaya de Silva and Roshen Silva, who defied the odds and held out for a draw.
The Test at the Feroz Shah Kotla ground was marred by severe pollution, with fast bowlers from both sides vomiting Tuesday amid thick smog.
"It was a tough time. The thing is, in Sri Lanka we are not used that, so that's why we struggled (on) the first two days," said Sri Lankan captain Dinesh Chandimal.
"But after that we needed to continue the game. We told the boys we have to forget about that and we need to play the game.
"Today is a fantastic day. It feels like Sri Lanka," quipped the captain, referring to the less smoggy weather Wednesday.
Dhananjaya, who retired hurt on 119 due to muscle stiffness, and Roshen (74 not out) held Sri Lanka steady over three sessions of play on the final day, after the visitors were set a huge 410 victory target late on day four.
Indian skipper Virat Kohli praised the Sri Lankan batsman for digging their heels in on a wearing pitch.
"Always when you're not able to finish the game off in the second innings, especially when you had them three down yesterday, feels a bit of (a) disappointment, but I wouldn't say it's a very bad feeling," he said.
"They played well, firstly, credit to them. They really stuck it out. Their batsmen really applied themselves, showed composure and confidence and didn't give our bowlers anything throughout the day."
SCORES IN BRIEF
INDIA: First innings 536 for 7 decl
SRI LANKA: First innings 373
INDIA: Second innings 246 for 5 decl
SRI LANKA: Second innings 299 for 5 (De Silva 119 rtd hurt, Chandimal 36, R Silva 74 not out, Dickwella 44 not out; Jadeja 3-81)
Result: Match drawn and India won the three-match series 1-0.
Player-of-the-match: Virat Kohli.
Player-of-the-series: Virat Kohli.