That’s a slick start. The No. 1 draft pick donned Maple Leafs gear for the first time last night, sinking four goals in just two periods against Ottawa. Netting the quickest hat trick for a debuting player since 1944 — and later managing a fourth — the 19-year-old called it a “pretty unbelievable” night. The Senators ultimately won 5-4 in overtime, with Matthews taking responsibility for a defensive lapse. But fans will likely forgive: At this pace he’d break Wayne Gretzky’s 894-goal record by early 2019.