By Joshua Lees Scottie Scheffler has been warned of the threat posed by Rory McIlroy, as the two leading players in the world head into next month’s Masters as the tournament favourites. Scheffler is unsurprisingly the man at the top of the betting, with the American showing exactly why he is world No. 1 in recent weeks. Earlier this month the 27-year-old won back-to-back PGA Tour events, winning the Arnold Palmer Invitational at Bay Hill followed by the Players Championship a week later. His Players victory at TPC Sawgrass was an historic one, as Scheffler became the first player to defend th…