Gary Anderson beat Dave Chisnall and Michael van Gerwen to win the Premier League title for a second time.
The 44-year-old Scot, who won the PDC World Championship in January, had finished third in the group phase.
Anderson overcame Chisnall in a deciding leg in his semi-final before beating Van Gerwen 11-7 in the final to claim a £200,000 first prize.
"It's four years since I had my hands on this trophy and it means a lot," said Anderson, who also won in 2011.
World number one Van Gerwen beat fellow Dutchman and defending Premier League champion Raymond van Barneveld in his last-four tie, but missed chances to pressure Anderson in the final, which was played in front of 11,000 people at London's O2 Arena.
Van Gerwen said: "Gary played well and he's a fantastic player, but tonight Dave missed three match darts against him and I missed about five legs on my doubles. The luck was on his side tonight and sometimes you need to have that."