In 2016, "The Grand Home Season" began for India, including series at home against New Zealand, England, Bangladesh and Australia. India whitewashed New Zealand to regain the number one ranking in Test cricket after almost 10 years. Before the series against England in November 2016, MS Dhoni resigned as captain of India in limited overs, thus handing the captaincy to Virat Kohli across all formats. India beat England across all three formats, with a notable 4–0 win in the Test series. This was followed by Test series wins against Bangladesh and Australia, which meant India reclaimed the Border Gavaskar Trophy. Ravichandran Ashwin became the fastest cricketer of all time to reach 250 wickets; he and Ravindra Jadeja occupied the top two spots in both the ICC Bowlers and All-Rounders rankings at the time. In the process, India became the third team (after South Africa and Australia) to have won their most recent Test series against all the other Test-playing nations. India holds an unbeaten streak of 8 consecutive Test series wins as of 19 August 2017.
The ball is a hard leather-seamed spheroid, with a circumference of 22.9 centimetres (9.0 in). The ball has a "seam": six rows of stitches attaching the leather shell of the ball to the string and cork interior. The seam on a new ball is prominent and helps the bowler propel it in a less predictable manner. During matches, the quality of the ball deteriorates to a point where it is no longer usable; during the course of this deterioration, its behaviour in flight will change and can influence the outcome of the match. Players will, therefore, attempt to modify the ball's behaviour by modifying its physical properties. Polishing the ball and wetting it with sweat or saliva is legal, even when the polishing is deliberately done on one side only to increase the ball's swing through the air, but the acts of rubbing other substances into the ball, scratching the surface or picking at the seam are illegal ball tampering.
Eden Gardens in Kolkata has hosted the most Tests, and also has the second-largest seating capacity of any cricket stadium in the world, being capable of holding more than 66,000 spectators. Founded in 1864, it is one of the most historical stadiums in India, having hosted numerous historical and controversial matches. Other major stadiums in India include the Feroz Shah Kotla Ground, which was established in 1883 and hosted memorable matches including Anil Kumble's ten wickets in an innings haul against Pakistan. For the last two years, the ground has been undergoing renovation.