In an ODI Cricket Match, 2 new balls are used during each inning – one from each bowling end.
Thus, a total of 4 new balls are used in a Day International Cricket Match.
These rules were introduced in 2011 which stipulated that teams use two balls during the innings – one from each end.
This rule was introduced in order to reduce the wear and tear on the white balls being used. It was particularly to resolve the issue of the balls becoming overly discolored with dirt and grass-stains when used for a full 50 over innings.
In addition, bowlers are now also permitted to deliver two shot-pitched deliveries per over rather than one, enhancing their capacity for variety.