Cika wannan jumla: Slessor ta farko nasara a matsayin mai sana'a sun kasance a cikin zagaye na zagaye na gasar zakarun Turai
2013 Australian Goldfields Open 5<unk>4 a kan Jamie Clarke da 5<unk>2 a kan Cao Yupeng, kafin ya rasa 5<unk>2 ga Simon Bedford. Ya fara zama na farko a babban mataki na taron martaba ya zo ne a gasar Open ta Indiya ta hanyar ganin Kurt Maflin 4<unk>2. A New Delhi ya rasa 4<unk>2 zuwa Mark Davis. Slessor kuma ya sha wahala a zagaye na farko a Gasar Burtaniya da Welsh Open 6<unk>2 zuwa Liang Wenbo da 4<unk>1 zuwa Stephen Maguire bi da bi. Ya gama kakar wasa ta farko a yawon shakatawa a matsayin mai lamba 112 a duniya.