As we saw by Rory McIlroy's emotional reaction to winning the Masters and completing the career Grand Slam, the guy was under an insane amount of pressure to finally get the job done. McIlroy admitted he felt "pure relief" after winning the playoff against Justin Rose to make (more) golf history.

Jordan Spieth currently leads the contenders with three majors, but there are a handful of other players who could eventually win the career Grand Slam.

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.