Security concerns

The attack on cricketers and match officials in Lahore in March 2009 brought into tragic and dramatic focus a trend that began in Sri Lanka in 1987, when New Zealand abandoned their tour after a car bomb in Colombo killed 100 people. Nine years later, Australia and West Indies refused to play their World Cup games in Sri Lanka citing danger from the ongoing civil war. Subsequent series to be affected include New Zealand's tour of Pakistan in 2002, Australia and West Indies' tours of Pakistan the same year (eventually played at neutral venues), South Africa's tour of Sri Lanka in 2006, which was truncated halfway, England's of India in November 2008, when the ODI series was cut short by the attacks in Mumbai, and India's proposed tour of Pakistan in 2009.

May 21, 2015: 'Being shot changed my life' - Raza | May 19, 2015: Zimbabwe play empathy card as tour officially begins

The Kevin Pietersen controversy

Kevin Pietersen retired from limited-overs international cricket in May 201, and though he retracted that decision it set off a chain of events that led to his being dropped from the World Twenty20 squad. He was then involved in another controversy, sending text messages to players in the South African team then touring England, and was dropped from the final Test at Lord's despite having scored a match-saving century in the previous Test.

May 12, 2015: England's breakdown of trust | Apr 22, 2014: England's Pietersen folly

Corruption in cricket

Cricket's biggest match-fixing scandal was unearthed in 2000, when Hansie Cronje admitted he had accepted money to throw matches. Soon players from other countries were implicated, among them Mohammad Azharuddin and Saleem Malik. Since then, allegations of fixing - including the new phenomenon of spot-fixing - have cropped up sporadically, and it has been acknowledged that bookmakers and the underworld have been active in trying to influence cricket results and specific moments in play. In 2010, scandal reared its head again when three leading Pakistan players were questioned by Scotland Yard and suspended by the ICC over spot-fixing charges.

Feb 12, 2015: We are best prepared to prevent fixing - Richardson | Apr 14, 2015: Board panel has 82 questions for BCCI bosses

Chucking

Controversy over illegitimate bowling actions - a burning issue in the 1950s - flared up again in the mid-to-late-1990s after Muttiah Muralitharan was no-balled repeatedly in Australia. Since then a number of bowlers (Shoaib Akhtar, Shoaib Malik, Harbhajan Singh and Jermaine Lawson prominent among them) have undergone remedial work after having their actions reported.

Feb 7, 2015: 'If circumstances arise, will be ready for World Cup' - Ajmal | Apr 24, 2015: Narine reported for suspect action again

The Pakistan spot-fixing case

In September 2010 the ICC suspended three Pakistan players - Mohammad Amir, Mohammad Asif and Salman Butt - on allegations of what was later defined as spot-fixing. They were alleged to have carried out specific on-field actions, including bowling no-balls at pre-determined times, during the Lord's Test against England on the instance of a bookie. The three were later handed long bans by the ICC before the matter moved to the British Crown courts, where all three were convicted and sentenced to spells of detention.

Jan 29, 2015: Amir allowed to return to Pakistan domestic cricket | Jan 29, 2015: I believe cricket suffered because of me - Amir