Filby entered PDC Qualifying School in 2015 and, despite reaching the last 32 on the first day, he could not advance past the last 128 in the last three days to fall short of earning a tour card. At the World Cup, Filby and Petersen survived a match dart from Finland to win 5–4 before losing their singles matches against Michael van Gerwen and Raymond van Barneveld of the Netherlands in the second round. In the 2016 event they were defeated 5–1 by Singapore.