You have to be in it to win it. Only one player can win the calendar grand slam each year, and to be that man you have to win the first. Rory McIlroy met that condition at the Masters, where he also claimed his spot among an elite cohort of six players to have won all four major championships.

There have been so many memorable moments for Northern Ireland's Rory McIlroy at Quail Hollow that some of those might be overshadowed by recent accomplishments.

Now that Rory McIlroy has completed his career Grand Slam, what is left for him to conquer in professional golf? Jim Natz has a bold answer.