Profiles of the three Pakistan players embroiled in betting scam allegations who have been summoned to face cricket and government authorities for questioning in London on Wednesday.
The 25-year-old, interviewed by Scotland Yard detectives about the alleged blatant no-balls bowled in the fourth Test against England at Lord's last month, was appointed Pakistan captain on July 17.
His rise to the top came after Shahid Afridi announced his retirement from Test cricket, with Butt becoming the team's 28th skipper overall and fifth since January 2009.
After schooling in his home city of Lahore, Butt earned a place on the national under-17 team before selectors finally drafted him into the senior squad in 2003, making his debut against Bangladesh.
A left-handed opening batsman, he has a determined air about him and is one of the few younger players in the team confident when speaking English.
His breakthrough came in 2004 when he scored his first one-day century against India at Eden Gardens and then went on to notch a maiden Test century in Sydney later in the year.
He has so far played in 33 Tests, scoring 1,889 runs at an average of 30.46 with a top score of 122.
Aamer is one two bowlers claimed to have delivered no-balls at the exact point in last month's Lord's Test against England that were agreed with alleged fixer Mazhar Majeed.
The 18-year-old left-arm seamer has risen rapidly through the ranks after being spotted aged 11 and moving from his remote village of Gujjar Khan to a sports academy in Rawalpindi.
The youngest of seven children, he came through Pakistan's under-19 side and impressed with his swing and pace, attributes which led to experts comparing him with former Pakistan left-arm great Wasim Akram.
Heralded as a star in the making, he took a career-best six wickets in England's only innings at the Lord's match before Pakistan succumbed to a record Test drubbing.
Aamer made his debut in July 2009 against Sri Lanka and has since played 14 Tests, bagging 51 wickets at an average of 29.09.
Asif, the other bowler implicated in the spot-fixing allegations, is no stranger to controversy with the 27-year-old's career having more lows than highs.
Like Aamer, he hails from a poor, remote village and got his break in January 2005 against Australia after impressing in domestic Pakistani cricket.
But he bowled 18 overs without taking a wicket and was dropped, only to return a year later.
A lucrative contract with Leicestershire in the English county championship followed but he struggled to handle the pressure and tested positive for a banned steroid in 2006.
He was banned for a year but this was overturned on appeal. Asif again failed a drugs test in the inaugural Indian Premier League season in 2008 and this time a two-year ban stood.
Even after the IPL ban ended, Asif's career was hit by a scandal with a film star, who alleged he owed her huge amounts of money in debts.
But Asif promised he had reformed. Compared to Australian great Glenn McGrath for his accurate pace, he fulfilled his promise and in recent months rose to the top of the International Cricket Council bowlers' rankings.
He has so far claimed 106 wickets in 23 Tests at an average of 24.36.