The Australian beat Mark Selby 10-7 in the final at York’s Barbican Centre to add to his 2010 World and 2012 Masters titles and became only the eighth player – and the first from outside the British Isles – to win all three.
The 31-year-old from Melbourne, who is also ranked No 1 in the world, was watched by mother Alison and acknowledged the sacrifices she and the rest of his family made when he embarked on his professional career.
Robertson famously relocated to Cambridge 10 years ago with just enough money to buy a waistcoat and begin entering events on the professional tour.
And he said of Alison’s support: “She really is a fantastic mum, she hasn’t done it easy raising myself and my brother. She’s worked so hard, as well as her partner Chris, to help with my career.
“When I came over in 2003 they helped me so much, along with my father. Without their support I probably wouldn’t be here.”
Robertson plans to treat his mother, who was as emotional as her son after victory.
“She’s been fantastic all week and I’m sure she’ll get some nice Christmas presents now,” he added.