Both smashed their way through in one-sided routs as Heta in particular finally got a win over his recent nemesis in Joe Cullen who defeated him at the World Matchplay, a World Series tournament and a World Grand Prix.
But he took advantage of a poor display from 'The Rockstar' to seal a confidence boosting 6-1 win with a 92 average, two 180's and 42.9% on the doubles en route.
While for Clemens, his run also continues with a 6-1 win with 'The German Giant' taking apart Mensur Suljovic who has looked so good on his big stage return including defeating Gerwyn Price yesterday.
But he averaged just 83 with a telling 11.1% on the doubles which Clemens who wasn't at his best himself took full advantage of with two 180's, a high checkout of 142 and 6/18 on the outer ring and they will now meet later.
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HETA KO's CULLEN!🔥
Damon Heta finally gets a victory over Joe Cullen and in some style! The World Cup winner confidently defeats an out-of-sorts Cullen 6-1 to complete our quarter-final lineup!
Join us again on video.pdc.tv from 1800 BST for the quarter-finals!