Michael van Gerwen made sure of his spot in the Premier League play-offs with an emphatic whitewash victory over James Wade in Cardiff on Thursday.
The top-four race is still wide open, however, after wins for Raymond van Barneveld and Stephen Bunting as well as a draw between Phil Taylor and Adrian Lewis.
The Dutchman recorded the season's highest average of 116.90 while hitting seven perfect darts in one leg, as well as five 180s and finishes of 105, 154 and 130 in the campaign's first whitewash.
The win secured his place at the O2 Arena in London next month, before he returned later in the night to face Gary Anderson, who recorded a 7-5 victory to consolidate third place.
Anderson had earlier lost 7-1 to Bunting, who sits in seventh place, three points off the top four with three matches left to play.
Taylor stays in fourth after Lewis fought back from 6-4 down to claim a share of the spoils, while reigning champion Van Barneveld made it three wins in a row after seeing off Dave Chisnall 7-5.