A native of Tasmania, Cadby began competing in Darts Players Australia (DPA) events in 2016 after relocating to Melbourne.[1] He won seven events during his debut season on the DPA Australian Grand Prix circuit, and finished first in the rankings, thus securing qualification for the 2017 PDC World Championship.[2]
In August 2016, Cadby lost 6–3 to 16-time world champion Phil Taylor in the first round of the Sydney Masters on his televised debut.[3] He played Taylor again a week later in the first round of the Perth Masters, winning 6–2 with an average of 103.58.[4] He went on to lose to Peter Wright 10–2 in the quarter-finals, with both players averaging 109.[5]
In October, Cadby qualified for the final of the PDC World Youth Championship, defeating Dimitri Van den Bergh in the semi-finals.[6] The final was played in Minehead, England in November, as part of the last night of the Players Championship Finals and Cadby beat Berry van Peer 6–2 to secure the title.[7]
Cadby won 2–0 in the preliminary round of the 2017 World Championship against China's Sun Qiang with an average of 102.48, a record for the prelims, to set up a first round tie with 28th seed Joe Cullen. In a high quality contest, Cadby took the opening set, but went on to lose 1–3. He took out six ton-plus finishes in the two matches he played.[8]
In 2018, Corey competed at PDC Q School. On the first day of play, Cadby defeated Callan Rydz 5–2 in the final four to secure his PDC Tour Card.[9] On 10 February 2018, Cadby won his first PDC title since winning his tour card the previous month in the 5th UK Open qualifier, defeating reigning World Champion Rob Cross in the final with an average of 108.77.[10]
After problems getting to the UK to play the ProTour, Cadby resigned his Tour Card at the start of 2020 despite being in the top 64.
2023
In 2023, Cadby returned to darts at Q–School to win back his tour card, which he managed to do with a 101 average in a win over Karel Sedláček in the Day 2 Final.[11] However, Cadby did not participate in any PDC darts events throughout 2023 and as a result of this the PDC removed his tour card in January 2024.[12]
