Bryson DeChambeu is refusing to back down in the lawsuit against the PGA Tour and believes he is still owed £1.5m.
DeChambeau, who has defected to Saudi-funded breakaway circuit LIV Golf, says he should have earned £3m for finishing fifth last year as part of the Player Impact Program bonus - but has only received half.
The American has claimed he was told by the PGA Tour that he would not meet the requirements to receive the bonus, despite attempting to do so.