The Open Championship returns this week. You will have to consider a number of factors that could affect the outcome of the tournament, research into the venue and form of the players will be important in making a decision on who to back. Ask questions such as - What kind of layout do the holes take? Does the course suit players who have a better short game or players who play long, powerful drives? What are the greens like? You may also want to look at the players' previous records at the venue or at similar venues, have they won any tournaments there before? Have they played there often before?