#4 Wrestlemania XXVII
Planned match affected: Triple H vs Sheamus
At WrestleMania XXVI, Triple H defeated his real-life training partner, Sheamus in a heated battle.
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The following month, Sheamus destroyed Triple H in a street fight, and was responsible as a part of the storyline for sidelining him for the rest of the calendar year.
The long term plan was for "The Game" to return prior to WrestleMania XXVII and exact his revenge versus the "Celtic Warrior" at the big show. However, in late 2010, when WWE were drawing up their plans for WrestleMania XXVII, they found they had no marquee matches lined up.
So, the Sheamus bout was scrapped and Triple H was pitted against The Undertaker instead. Triple H blasted Sheamus on his Raw return instead to cap off their program before he moved onto to the "Phenom."
This was a positive move. That match stole the show on the card and played into the Shawn Michaels retirement storyline from the year prior, which would culminate in an even better match between Triple H and Undertaker at WrestleMania XXVIII, the following year.
If the match did indeed go ahead as per plan, The Game would invariably have taken Sheamus to the cleaners. The fact that he took a loss at the hands of the Undertaker to make business look good shows you that Triple H is indeed the right man for the job.