If a fielder is injured or becomes ill during a match, a substitute is allowed to field instead of him, but the substitute cannot bowl or act as a captain. The substitute leaves the field when the injured player is fit to return. The Laws of Cricket were updated in 2017 to allow substitutes to act as wicket-keepers, a situation that first occurred when Mumbai Indians' wicket-keeper Ishan Kishan was injured in a match on 18 April 2018.
After failing to reach the semifinals at the 1999 Cricket World Cup, Tendulkar was again made captain, and had another poor run, losing 3–0 on a tour of Australia and then 2–0 at home to South Africa. Tendulkar resigned, vowing never to captain the team again. Ganguly was appointed the new captain and the team was further damaged in 2000 when former captain Azharuddin and fellow batsman Ajay Jadeja were implicated in a match-fixing scandal and given life and five years bans respectively. This period was described by the BBC as "the Indian cricket's worst hour". However, the new core – Tendulkar, Dravid, Kumble and Ganguly – swore not to let this happen to them again, and lead Indian cricket out of the dark times. And the first three put aside personal ambitions to let Ganguly lead them into a new era.
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.
The ICC also organises competitions that are for several countries at once, including the Cricket World Cup, ICC T20 World Cup and ICC Champions Trophy. A league competition for Test matches played as part of normal tours, the ICC World Test Championship, had been proposed several times, and its first instance began in 2019. A league competition for ODIs, the 2020–22 ICC Cricket World Cup Super League, is planned to begin in 2020. The ICC maintains Test rankings, ODI rankings and T20 rankings systems for the countries which play these forms of cricket.
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In contrast, India fielded a strong team in Test matches and was particularly strong at home, where their combination of stylish batsmen and beguiling spinners were at their best. India set a then Test record in the third Test against the West Indies at Port-of-Spain in 1976, when they chased 403 to win, thanks to 112 from Viswanath. This West Indian defeat is considered to be a watershed in the history of their cricket because it led to captain Clive Lloyd dispensing with spin altogether and relying entirely on a four-man pace attack instead. In November 1976, the team established another record by scoring 524 for 9 declared against New Zealand at Kanpur without any individual batsman scoring a century. There were six fifties, the highest being 70 by Mohinder Amarnath. This innings was only the eighth instance in Test cricket where all eleven batsmen reached double figures.
Ganguly became the regular captain of the team in both Tests and ODIs in 2000. He remained captain until 2005–06 and became the then most successful Indian captain, winning 21 of his 49 Test matches in charge and 76 of his 146 ODIs. Under his captaincy, India became the joint-winners of the 2002 ICC Champions Trophy with Sri Lanka, and the runners-up of the 2003 Cricket World Cup. India lost only three Tests at home under Ganguly and managed to draw Test series in England and Australia. Rahul Dravid took over as Test captain in 2005. In 2006, he led India to its first Test series victory in the West Indies in more than 30 years.