Cricket should be played in 'a gentlemanly manner' , which means no sledging, cheating, bodyline bowling , temper tantrums or excessive appealing. If the batsman knew he was out, he should 'walk' even if the umpire decided otherwise. Take a look at 5 of the biggest controversies of 2018.

5. Rabada controversy

The incident happened in the 52nd over of Australia's first innings of the second Test, when moving towards the slips, Rabada made contact with Steve Smith with his shoulder. The 22-year-old accepted a second charge under 2.1.7 of the code – using language, actions or gestures which could provoke an aggressive reaction from a batsman upon his or her dismissal. He received a further 15% fine of his match fee and an additional demerit point bringing his total to nine.

4. David Warner-De Kock incident

Ugly exchange of words between David Warner and Quinton de Kock during the first Test at Durban for which both the players have been charged by ICC. The video shows Warner being restrained by Australia batsman Usman Khawaja and spin bowler Nathan Lyon as he directs a verbal barrage at De Kock.

3. Naagin Dance

Nurul Hasan was seen arguing with Sri Lanka captain Thisara Perera after he was sent by the team on to the field of play to pass on a message to the two batsmen. He was found guilty of violating Article 2.1.2, which deals with "conduct that brings the game into disrepute".

2. Mohammad Shami-Hasin Jahan controversy

In shocking allegations, Indian cricketer Mohammed Shami's wife has accused him of cheating on her and torture her, mentally and physically, for more than a couple of year. According to a report, her husband Mohammed Shami, Hasin Jahan, shared a series of photos and screen shots of the fast bowler's alleged extramarital affair on her Facebook wall. The images include Shami posing with women and his reported chats with them.

1. Ball-tampering

Australian opener Cameron Bancroft was caught red-handed by television cameras appearing to rub a yellow object on the ball during the third Test. The ICC suspended Smith for one Test and docked his entire match fee while Bancroft got a 75 percent fine and three demerit points. Steve Smith along with the team's "leadership group", conspired to cheat by asking Bancroft to carry a foreign substance (sticky tape) and use it to alter the condition of the ball during Day 3 of the third Test against South Africa. Australia went on to lose the Test by 322 runs.