World number two Stuart Bingham was the big casualty on the opening day of the Scottish Open that also saw Ken Doherty bow out of the competition.
John Higgins, Judd Trump and Mark Allen were among those to safely book their passage to the second round, but the 2015 world champion lost 4-3 to world number 45 Mark Joyce.
Former world champion Doherty was defeated on a similar scoreline by Matthew Stevens.
Four-time world champion Higgins beat fellow Scot Alan McManus 4-1 after recovering from losing the opening frame as he seeks a 29th ranking title to move into second place on his own in the overall list behind Stephen Hendry's record of 36.
Next up for the 'Wizard of Wishaw' will be another fellow countryman after 22-year-old Scott Donaldson defeated Itaro Santos of Brazil 4-0 in one of Monday's late finishes.
“Alan has beaten me the last couple of times so I am very pleased to come through,” Higgins told the BBC afterwards.
“I feel as if I am into the tournament now and hopefully I can go far.
"I have won two tournaments in Scotland before, I can still remember them and I would love to win this one."
Elsewhere on day one, Judd Trump, the world number four, progressed with a 4-0 thrashing of China's Zhang Yong while Sean O'Sullivan made a break of 134 in his 4-1 win over Robbie Williams.
Welshman Mark Williams is also through after he beat Rod Lawler 4-0. Northern Ireland's Mark Allen, the world number nine, edged through against Christopher Keogan in another late night contest.
The tournament is the first World Snooker ranking event held in Scotland since the World Open in 2010.