The 2017–18 snooker season was a series of professional snooker tournaments played between 4 May 2017 and 7 May 2018. The season began with the pro–am Vienna Snooker Open in May 2017 and ended with the 2018 World Snooker Championship in April the following year. Ronnie O'Sullivan earned a joint-record five ranking titles in the season. He joined Stephen Hendry (&lt;a href="Snooker%20season%201990/1991"&gt;1990/1991&lt;/a&gt;), Ding Junhui (&lt;a href="Snooker%20season%202013/2014"&gt;2013/2014&lt;/a&gt;), and Mark Selby (&lt;a href="Snooker%20season%202016/2017"&gt;2016/2017&lt;/a&gt;) in winning five ranking titles in the same season.