Three-time world champion Michael van Gerwen was knocked out by Damon Heta on the opening night of the World Masters in Milton Keynes. The 36-year-old Dutchman - who won the Masters five times in a row between 2015 and 2019 - lost 3-1 to Australian number one Heta, who checked out 101 to seal his victory. World Championship runner-up Gian van Veen was solid on his Masters debut, progressing 3-1 past Ryan Joyce despite losing the first set, while former world champion Gerwyn Price racked up a three-dart average of 108.51 to defeat in-form James Hurrell. Jonny Clayton - last year's beaten Masters finalist - saw off Wessel Nijman 3-1, with Nathan Aspinall defeating Shane McGuirk by the same scoreline. Defending Masters champion Luke Humphries and world champion Luke Littler - the world number one - both enter the tournament on Friday.