Net Run Rate Within A Tournament
Most of the time, in limited overs cricket tournaments, there are round-robin groups among several teams, where each team plays all of the others. Just as explained in the scenarios above, the NRR is not the average of the NRRs of all the matches played. It is calculated considering the rate at which total runs are scored for and against, within the whole group.
Let's take as an example South Africa's net run-rate in the 1999 World Cup. South Africa's listing in the Group A points table published in the group stages was as follows:
| P | W | L | NR | T | Pts | Net-RR | For | Against |
|---|---|---|---|---|---|---|---|---|
| 3 | 3 | 0 | 0 | 0 | 6 | +1.495 | 678/147.2 | 466/150 |
The columns we are looking at here are the last three: "Net-RR", "For" and "Against". The figure in the "Net-RR" column is achieved by subtracting the answer of the division in the "Against" column from the answer to the division in the "For" column.
To use this example:
FOR
South Africa had scored, so far in the tournament:
Against India, 254 runs (for 6 wkts) from 47.2 overs Against Sri Lanka, 199 runs (for 9 wkts) from 50 overs Against England, 225 runs (for 7 wkts) from 50 overs
Across the three games, South Africa scored 678 runs in a total of 147 overs and 2 balls (actually 147.333 overs), a rate of 678/147.333 or 4.602 RPO (runs per over).
AGAINST
Teams opposing South Africa scored: India, 243 (for 5 wkts) from 50 overs. Sri Lanka, 110 all out from 35.2 overs. England, 133 all out from 41 overs.
In the case of Sri Lanka and England, because they were all out before their allotted 50 overs expired, the run rate is calculated as if they had scored their runs over the full 50 overs.
Therefore, the run-rate scored against India across the first three games is calculated on the basis of 466 runs in a total of 50 + 50 + 50 = 150 overs, a rate of 466/150 or 3.107 RPO.
NET-RR
The net run-rate is therefore + 4.602 - 3.107 = + 1.495 as shown in the table above.
Read more about this topic: NRR
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