Good performances are considered to be:
* A batsman scoring 50, or 100, or multiples thereof.
* A partnership adding 50, or 100, or multiples thereof.
* A bowler taking five wickets in a single innings.
* A bowler taking ten wickets in a two innings match. (This is an excellent performance and a relatively rare feat.)
* A bowler taking a hat trick, i.e. three wickets in three successive balls (perhaps in different overs). This is even more rare.
The following statistics are recorded:
number of runs scored, time spent batting, number of balls faced, how out (and by which bowler and catcher if appropriate).
number of overs bowled, number of maidens bowled, number of wickets taken, number of runs conceded (i.e. scored off his bowling).
extras, total runs, wickets fallen, overs bowled, total at each fall of wicket.
Over a single player's career, the two most important statistics are:
The aggregate number of runs scored divided by the number of times the batsman has been out. The higher, the better.
The aggregate runs scored against a bowler divided by the number of wickets taken. The lower, the better.
Each of these averages is kept separately for Test cricket, first class cricket in general, and one-day cricket. A batting average above 30 is very good, 40 excellent, and 50 is legendary. Mention must be made of the Australian batsman Sir Donald Bradman, whose career average was a record 99.94, far and away the greatest batsman ever to play the game. A bowling average below 25 is considered excellent.