Question: Mike Hallett was whitewashed by a professional snooker player who won the World Championship how many times?

Context paragraphs:
Graeme Dott: Graeme Dott (born 12 May 1977) is a Scottish professional snooker player and snooker coach from Larkhall.  He turned professional in 1994 and first entered the top 16 in 2001.  He has won two ranking titles, the 2006 World Snooker Championship and the 2007 China Open, and was runner-up in the World Championships of 2004 and 2010.  He reached number 2 in the world rankings in 2007, but a subsequent episode of clinical depression seriously affected his form, causing him to drop to number 28 for the 2009/2010 season.  He then recovered his form, regained his top-16 ranking, and reached a third World Championship final.  In 2011, he published his autobiography, "Frame of Mind: The Autobiography of the World Snooker Champion."

Steve Davis: Steve Davis, {'1': ", '2': ", '3': ", '4': "} (born 22 August 1957) is an English retired professional snooker player from Plumstead, London.  Known for dominating the sport during the 1980s, when he won the World Championship six times and was ranked world number one for seven consecutive seasons, he is remembered particularly for contesting the 1985 World Championship final with Dennis Taylor, the black-ball conclusion of which attracted a record 18.5 million British viewers.  He is a well known public figure and is generally viewed by his peers as one of the greatest players of all time.  Until his retirement in 2016, Davis combined his ongoing playing career with his role as a television analyst and commentator for the BBC's snooker coverage, alongside being a DJ of electronic music on local radio station Phoenix FM and at the Bloc Weekend music festival.

Reanne Evans: Reanne Evans (born 25 October 1985 in Dudley, West Midlands) is an English former professional snooker player who now competes as an amateur.  She is a multiple WLBSA Ladies World Snooker Championship, a title she won a record ten successive times between 2005 and 2014, before losing to Ng On Yee in the semi finals in 2015.  She played on the main professional snooker tour during the 2010–11 season, but she failed to win any matches and was unable to retain her place on the tour in subsequent seasons.  In May 2013, she qualified for the 2013 Wuxi Classic as an amateur competitor, becoming the first woman ever to reach the final stages of a ranking snooker tournament.  She became one of four players selected to play against local opponents in a wildcard round, where she lost 2–5 to Zhu Yinghui.

Alexander Ursenbacher: Alexander Ursenbacher (born 26 April 1996) is a Swiss professional snooker player from Rheinfelden.  He is Switzerland's second professional snooker player after Darren Paris, who competed on the main tour in the mid-1990s.  He is current Under-21 European Snooker Champion.

Manish Jain: Manish Jain (born 25 August 1988) is an Indian Billiards and Snooker player.  Manish started his career in 2004 after being Ranked 2nd at the West Bengal State Junior Billiards Championship and Ranked 3rd in the Snooker Championship.  In 2005 he represented West Bengal in the National Billiards & Snooker Championship at the Goregaon Sports Club, Mumbai.  In 2006 he represented West Bengal in the National Billiards & Snooker Championship at Vijaya Mehal Chennai.In 2007 he Represented West Bengal in the National Billiards & Snooker Championship at Hyderabad and Ranked 2nd In Billiards & Snooker both in India.  He also won the State Junior Snooker Championship in 2007 and Ranked2nd in the State Senior Snooker Championship at West Bengal.  In 2008 Manish represented India at the Asian U-21Snooker Championship held at Yangon,Myanmar.  In 2008 he won the State Junior Snooker & Billiards Championship both held at the Bengal Rowing Club.  In 2009 he represented India in the Asian U-21 Snooker Championship at Pune.  In 2010 Manish joined Eastern Railways under Sports Quota to become a full time professional in Billiards & Snooker.  In 2011 he Represented India in the World Sooker Q- School.  He also won the State Snooker Championship at the Bengal Rowing Club.He also represented India in the World Professional Billiards Championship at Leeds, U.K.  In 2012 he won the State Senior Billiards Championship at the Bengal Rowing Club.  He then went on to represent India in the World Billiards Championship at the Northern Snooker Centre at Leeds, U.K.  He participated in the All India Invitation Billiards & Snooker Championship, Baroda and Beat 9 times World Champion Geet Sethi in the Group Stage and Participated.  In 2013 he represented India at the Australian Open Billiards Championship and made it to the Round of 16.  He represented West Bengal in the National Billiards & Snooker Championship at Gwalior and finished Ranked 6th in the National Senior Billiards Championship.  In 2014 he won both the State Billiards & Snooker Championship at the Bengal Rowing Club.  .

Mike Hallett: Mike Hallett (born 2 July 1959) is an English former professional snooker player and television sports commentator.

Dene O'Kane: Dene O'Kane (born 24 February 1963) is a former professional snooker player from New Zealand.  He reached the quarter-finals of the World Championships in 1987 and 1992.  He made his World Championship debut in 1985, losing to David Taylor in the first round.  He appeared in the world championships six times, but never in consecutive years .  He was a runner up in the Hong Kong Open in 1989, losing 8–9 to Mike Hallett after leading 8–6.

Pankaj Advani: Pankaj Arjan Advani (born 24 July 1985 in Pune) is an Indian professional player of English billiards and former professional snooker player.  In recognition of his achievements, the Government of India has bestowed several awards upon Advani—Arjuna Award in 2004, Rajiv Gandhi Khel Ratna in 2006, and Padma Shri in 2009.  He has achieved a hat-trick of hat-tricks in English billiards, holding the World, Asian, and Indian National Championship titles simultaneously, in three different years: 2005, 2008 and 2012.  He became a snooker professional only in 2012, and his first season on the main tour was the 2012/2013 season.  Advani won the 2014 IBSF World 6-Red Snooker Championship, on his debut in that discipline.  He is the only player ever to win world titles in both the long and short formats of snooker (15-red standard, and 6-red) and both formats of English billiards (time and point).  Advani is also India's first world champion in 6-red snooker.  On 14 August 2014, Advani helped win the first ever World Team Billiards Championship held in Glasgow, Scotland, along with Rupesh Shan, Devendra Joshi and Ashok Shandilya.

Hossein Vafaei: Hossein Vafaei (Persian: حسین وفایی ایوری‎ ‎ , born September 14, 1994 in Abadan, Iran) is an Iranian professional snooker player.  He was the first Iranian professional snooker player in the history of the game.  His attempts to travel to the United Kingdom to qualify for the major tournaments on the snooker calendar were denied due to visa problems, but he gained a UK visa in February 2015.

2015 Masters (snooker): The 2015 Dafabet Masters was a professional non-ranking snooker tournament that took place between 11 and 18 January 2015 at the Alexandra Palace in London, England.  It was the 41st staging of the tournament.  Shaun Murphy won his first Masters title, beating Neil Robertson 10–2 in the final, the biggest winning margin in a Masters final since Steve Davis whitewashed Mike Hallett 9–0 in 1988.  In winning the title, Murphy became the tenth player to win all Triple Crown events at least once.

Supporting paragraphs: 2015 Masters (snooker) Steve Davis
Answer: six