During play of the game, a member of the fielding team is designated as the bowler, and bowls deliveries toward the batsman. Six legal balls in a row constitutes an over, after which a different member of the fielding side takes over the role of bowler for the next over. The bowler delivers the ball from their end of the pitch toward the batsman standing at the opposite wicket at the other end of the pitch. Bowlers can be either left-handed or right-handed. This approach to their delivery, in addition to their decision of bowling around the wicket (from the sides of the wicket on the bowler's end) or over the wicket, is knowledge of which the umpire and the batsman are to be made aware.
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Deliveries can be made by fast bowlers or by spin bowlers. Fast bowlers tend to make the ball either move off the pitch (‘seam’) or move through the air (’swing’), while spinners make the ball ’turn’ either toward a right-handed batsman (as in the case of off spin and left-arm unorthodox spin) or away from him (as in the case of leg spin and left-arm orthodox spin).
The ball can bounce at different distances from the batsman, this is called the length of the delivery. It can range from a bouncer (often bouncing as high as the batsman's head) to a yorker (landing at his feet).
There are many different types of delivery that a bowler can bowl. These deliveries vary by: technique, the hand the bowler bowls with, use of the fingers, use of the seam, how the ball is positioned in the hand, where the ball is pitched on the wicket, the speed of the ball, and the tactical intent of the bowler.
The variations in different types of delivery, as well as variations caused by directing the ball with differing line and length, are key weapons in a bowler's arsenal. Throughout an over, the bowler will choose a sequence of deliveries designed to attack the batsman's concentration and technique, in an effort to get him out.
The bowler also varies the amount of loop and pace imparted to various deliveries to try to cause the batsman to misjudge and make a mistake. As the crease has a width, the bowler can change the angle from which he delivers to the batsman in an attempt to induce a misjudgement.
Usually, the bowler decides what type of delivery to bowl next, without consultation or even informing any other member of his team. Sometimes, the team captain will offer advice or even issue a direct order regarding what deliveries to bowl, based on his observations of the batsman and the strategic state of the game. Another player who occasionally offers advice to the bowler is the wicket-keeper, since he has a unique view of the batsman and may be able to spot weaknesses of technique.
Another piece of information important for the bowlers to consider prior to their deliveries is the state of pitch. The pitch is a natural ground and its state is subjected to variation over the course of the cricket, some of which are multi-day events such as test matches. Spinners find an old pitch, one that has been frequently used, more suitable to their deliveries rather than a fresh pitch, one that hasn't come under use as much such as a pitch at the start of the match.
While a bowler, with the use of variations in their delivery aims to target the concentration of batsmen as well as their skill and technique of batting, anticipation of the delivery is crucial for the batsman, as emphasised by Jodi Richardson. Richardson reveals the world class batsman's dilemma while facing fast bowlers, stating that the time between the batsmen's anticipation of the trajectory of the ball and positioning themselves for the appropriate shot can be twice as long as the interval between the ball leaving the bowler's hand and reaching the batsman's crease. Side by side, Richardson alludes to the research undertaken by Dr. Sean Müller in Australia which was partly funded by Cricket Australia's Centre of Excellence. The results of the research demonstrated the importance of anticipation of the delivery for batsmen in cricket. They revealed that experienced batsmen possessed a unique ability which enabled them to adjust their feet as well as their positioning on the crease accordingly based upon their reading of the body language and movements enacted by the bowler prior to the release of the ball. This foresight that batsmen use while on the crease is referred to as 'advance information' by Richardson. Moreover, Müller's research outlined that the presence of this 'advance information' was not as evident among the lesser skilled batsmen in comparison to the experienced ones.
Underarm or lob bowling was the original cricket delivery style,but had largely died out before the 20th century, although it was used until 1910 by George Simpson-Hayward, and remained a legal delivery type. On 1 February 1981, when Australia was playing New Zealand in a One Day International cricket match, and New Zealand needed six runs to tie the match from the final ball. Greg Chappell, the Australian captain, ordered the bowler (his brother Trevor) to bowl underarm, rolling the ball along the ground to prevent the Number 10 New Zealand batsman (Brian McKechnie) any chance of hitting a six from the last ball to tie the match.
After the game, the then Prime Minister of New Zealand, Rob Muldoon, described it as "the most disgusting incident I can recall in the history of cricket." At the time, underarm deliveries were legal, but as a direct result of the incident, underarm bowling was banned in limited overs cricket by the International Cricket Council as "not within the spirit of the game." The 2000 Code of the Laws of Cricket declares that an underarm delivery is illegal unless otherwise agreed before the match.
A recently retired cricketer who was greatly embroiled in controversy and under scrutiny from critics over his method of executing deliveries was the Sri Lankan spinner Muttiah Muralitharan. Michael Selvey describes the accusations placed on the bowler in relation to his widely disputed bowling action and delivery, stating the Australian prime minister's reference to the Sri Lankan as a 'chucker.' The controversy linked to Muralitharan's delivery emerged in 1995, when the umpire of the test match between Sri Lanka and Australia deemed Muralitharan's delivery as illegal on the suspicion that he was throwing the ball. Selvey acknowledges this as the factor sparking an 'international cricket incident,' with critics and some extremists going as far as insisting on the exclusion of all of the Sri Lankan's accomplishments throughout his career from the records of cricket. However, Suresh Menon takes an adamant stance on the topic of the controversy surrounding the spinner by displaying appreciation for Muralitharan's actions. Menon suggests that investigation into Muralitharan's deliveries led to the revelation of imperfections present in the bowling action and deliveries of the previously considered 'picture-perfect' fast bowler, Glenn McGrath. This was made possible with the usage of technology and its replacement of the earlier system, which Menon refers to as 'the naked eye.' Eventually, it was declared legal for the bowlers to bend their arm fifteen degrees for deliveries in cricket.
A delivery or ball in cricket is analogous to a pitch in baseball. The word ball in cricket usage does not imply anything about the accuracy of the delivery, unlike baseball's usage of ball to indicate a pitch outside the strike zone. The cricket equivalent of a baseball ball is a wide or a no-ball.