The Muralitharan Chucking Controversy — The Full Saga

Muttiah Muralitharan was born in 1972 in Kandy, Sri Lanka, into a Tamil family. He developed his bowling action through schoolboy and club cricket in Sri Lanka with no formal coaching, against the unusual physical background of a wrist that could rotate further than typical and an elbow that could not fully straighten — the latter the result of a congenital condition that meant his arm was, at maximum extension, slightly bent. By the time he made his Test debut for Sri Lanka against Australia in August 1992, the combination of natural wrist rotation and constitutional elbow flex had produced a bowling action unlike any other in international cricket: a high-rotation off-spinner whose deliveries appeared, to the unaided eye, to involve an arm-straightening that the Laws of Cricket prohibited.

Article 24.3 of the Laws (in the form then in force) defined a fair delivery as one in which the bowler did not straighten his arm at any point during the delivery stride. Bowlers whose actions involved any visible straightening were, in principle, to be called for "throwing" — colloquially "chucking." The Law had stood since the formal codification of bowling in the 19th century and had been used to call out a series of bowlers across cricket history, most prominently Tony Lock and Charlie Griffith. By 1995 the legal framework was clear in principle but had no biomechanical method for distinguishing a genuine throw from the visual impression of a throw. The unaided eye of the umpire, watching at full speed from square leg or behind the stumps, was the only available test.

Muralitharan toured Australia in 1995-96 carrying a record of 80 Test wickets and a growing international reputation. The Australian crowd response to his bowling was already aggressive — the first Test of the series at Perth had produced sustained heckling about his action — but no umpire had ever called him for throwing. On Boxing Day 1995 at the MCG, in the second Test of the series, umpire Darrell Hair called Muralitharan for throwing seven times in three overs from his end. The call was made not on a particular delivery for which Hair had close visual evidence of straightening, but as a categorical rejection of the action as a whole — Hair's later position was that he had been certain throughout the over that the action was illegal and that calling individual deliveries was the only mechanism the Laws gave him.

The reaction was immediate and prolonged. Sri Lankan captain Arjuna Ranatunga led his side off the field briefly in protest. Muralitharan was switched to Tony McQuillan's end and was not called by McQuillan. The match continued. Sri Lanka eventually lost the Test. The wider crisis only began afterwards. Hair's call had brought into the open a question the international game had been postponing: was Muralitharan's action — and by implication, were similar actions by other bowlers — actually illegal under the existing Law, or did the existing Law fail to capture the difference between visual appearance and biomechanical reality? The ICC's response was to commission what would become a decade of biomechanical research that ultimately rewrote the Law itself.

The chucking controversy surrounding Muttiah Muralitharan was not a single incident but an extended saga that lasted over a decade and reshaped cricket's laws. After Darrell Hair's no-balling in 1995, Muralitharan was subjected to multiple rounds of biomechanical testing at the University of Western Australia and Hong Kong University. Each time, scientists found that his unusual action was the result of a congenital defect — he could not fully straighten his bowling arm, which created an optical illusion of throwing.

In January 1999, umpire Ross Emerson called Muralitharan for throwing during an ODI against England in Adelaide. Sri Lankan captain Arjuna Ranatunga was furious and led his team to the boundary rope, threatening to abandon the match. The ICC intervened, and Emerson was stood down from umpiring. The incident further polarized opinion between the subcontinent and Australia/England.

The ICC commissioned comprehensive biomechanical research that produced a landmark finding: virtually every bowler in world cricket flexed their arm to some degree during delivery. Fast bowlers were found to flex as much or more than spinners. In 2004, the ICC introduced the 15-degree tolerance rule, replacing the subjective visual assessment with an objective scientific threshold. This was arguably the most significant change to bowling laws since the legalization of overarm bowling in 1864. Muralitharan's saga forced cricket to confront its own biases and adopt a scientific approach to its laws.

“You are throwing. In my mind, it is a no-ball.”

“If they want to call me a chucker, that is up to them. I know my action is fair.”

“We have found that nearly every elite bowler in our sample exceeds the existing limits. The Law is not capable of distinguishing what it is supposed to distinguish.”

“Below fifteen degrees, the human eye cannot reliably distinguish a straightening arm from a held arm. The Law must be calibrated to what umpires can actually see.”

“I never thought my action was illegal. I knew what my arm was doing. I always knew it was within the spirit of the game.”

The biomechanical research the ICC commissioned in the years after Hair's call produced two findings that together transformed the Law. The first was that Muralitharan's distinctive visual impression of arm-straightening was substantially the result of his constitutional elbow flex combined with the high rotation of his wrist; biomechanical measurement showed that his elbow flexion during delivery was, on most balls, within tolerance ranges that would have been considered clearly legal for a finger-spinner. The second finding — produced by Marc Portus, Bruce Elliott and Paul Hurrion in research conducted on 21 elite fast bowlers from five countries between 2000 and 2002 — was much more far-reaching: that almost every international bowler in the sample, including bowlers whose actions had never been questioned by any umpire, exhibited elbow flexion exceeding the existing legal limits.

The implication was structural. The existing Law, rigorously applied, would have called the actions of essentially every Test bowler in the world. The visual appearance of "throwing," which the Law was designed to capture, was in fact a poor proxy for the biomechanical reality of arm action. The ICC's response in November 2004 was to adopt a new universal 15-degree elbow flexion limit applicable to all bowlers — fast, medium and spin — replacing the previous tiered limits. The 15-degree threshold was set on the research finding that human visual perception of arm-straightening began at roughly that angle. Below 15 degrees, the human eye could not reliably distinguish a straightening arm from a held arm.

Muralitharan, whose initial elbow flexion had been measured at approximately 14 degrees on the doosra and lower on his standard off-spinner, was clearly within the new limit. The doosra in particular required remedial work — even after the rule change, he was found to be bowling it at just above 10 degrees — but the action as a whole had been formally certified legal. He returned to international cricket without further interruption, took 800 Test wickets — a record that has stood since his retirement in 2010 — and finished his career as the most successful spin bowler in the history of cricket.