 Complete the following phrase:  In January 2015, Petersen played in Q School and earned a two-year tour card on the second day by defeating Chris Hartrey 51 in the final round. Petersen did not base himself in Britain for 2015 and estimated he would make 20 trips back and forth from South Africa during the year. He entered the UK Open in the second round stage and beat Mark Cox 54, Mark Barilli 98, Jamie Caven 96 and Eddie Dootson 93 to reach the quarter-finals of a major PDC event for the first time. Petersen led world number one Michael van Gerwen 32 at the first break but had had darts to win every leg and went on to lose 105. He became the first South African to throw a nine-dart finish on the PDC tour at the sixth Players Championship and went on to reach the quarter-finals where Van Gerwen whitewashed him 60. At the 