The sentimental angle is also in play with McIlroy because The Open is being played in his home country of Northern Ireland. Scheffler, McIlroy and Jon Rahm are considered the three favorites to win the Claret Jug, as they have been for most of the major-tournament season.

Vegas oddsmakers have some ideas on who might be walking away from Portrush as a major champion. Here's a look at this week's betting odds.