De Decker keeping grounded ahead of Littler test at Grand Slam of Darts
De Decker – the World Grand Prix champion – produced a commanding display to win his final Group E match 5-0 on Tuesday and book his place in the event's last 16.
The 28-year-old averaged more than a ton against former champion Smith, who wasn't handed the chance of a checkout in his 5-0 defeat.
"If I could bring 100 per cent of my floor game onto the stage I would be a much more relaxed player," De Decker said.
"I'm feeling more comfortable on stage though, and it showed again tonight."
Victory secured De Decker second place in the group behind Jermaine Wattimena and a knockout match against teenage sensation Littler.
Littler emerged from Group F with a flawless record and dazzled in his last outing against Lourence Ilagan, throwing eight darts into a nine-darter before narrowly missing double 12.
"It's going to be a great game against Luke and I'm really looking forward to it," De Decker previewed.
