With the Royal Rumble on the horizon, WrestleMania season is nearly here as the WWE continues to put the pieces into place for the biggest show of 2015.

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WrestleMania 31 will take place live from Levi's Stadium in California on March 29 and should be a blockbuster event for the WWE.

According to Wrestlingheadlines.com, there is a feeling that the rumored Bray Wyatt vs. Undertaker bout may actually occur at the "Show of Shows."

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Per the report, there was a feeling after last week's RAW that Wyatt going over Dean Ambrose in the Ambulance Match is a sign that The Undertaker will be coming back to work a program with the "Eater of Worlds" and the WWE wants him to look strong.

People backstage were reportedly shocked that Ambrose lost the match to Wyatt and there is a belief that the WWE just isn't interested in protecting Ambrose right now, but there is a possibility that he will turn heel in the near future.

With a Wyatt vs. Undertaker match probable, depending on if the "Deadman" wants to return after losing The Streak and getting injured at WrestleMania XXX in his match against Brock Lesnar, here is a look at four other possible bouts.

1) Brock Lesnar vs. Roman Reigns for the WWE World Heavyweight Championship: The rumored plan for a while has been to have Lesnar look strong and then build a new No. 1 face for the WWE by jobbing to Reigns at the "Show of Shows."

While that could still be the plan, there have been reports that ever since Daniel Bryan announced his return and desire to face Lesnar in the ring, the WWE might change its plans. Bryan, after all, never lost the title and had to forfeit it due to his neck injury.

The WWE is very high on Reigns and Vince McMahon has reportedly been personally writing his promos while the company is hopeful to groom him into a big star by sharpening his mic skills.

Lesnar ended The Streak of The Undertaker and then dominated John Cena at SummerSlam to build himself up to pass the torch. While there are some question marks surrounding the WWE's final plans for WrestleMania 31, a Reigns vs. Lesnar match is the most likely scenario.

2) Sting vs. Triple H: There were rumors that Sting may face The Undertaker and Triple H could battle The Rock on March 29, but a Sting vs. Triple H bout is more likely.

The Undertaker is a huge question mark this year and if he does decide to come back, it seems likely he'll face Wyatt. As for The Rock, he teased a match with Triple H, but it appears his movie schedule will keep him out of the ring.

Sting and Triple H had an epic stare down at the Survivor Series in November and Sting helped Team Cena defeat Team Authority in the elimination main event.

Triple H has bashed Sting in storyline since that encounter and the WWE seems to be building toward a match between the two, which will mark the first contest in the WWE for Sting and possibly the last of his career.

3) John Cena vs. Rusev: The WWE has built up Rusev as an unstoppable monster and there are rumors that he could clash with the WWE's unbeatable No. 1 babyface at the biggest show of the year.

The WWE will likely use Cena to help elevate Rusev, like they tried to do when the "Cenation" leader clashed with Bray Wyatt at last year's event.

Rusev will likely remain undefeated until his battle with Cena and while a win would be huge for the reigning United States Champion, it appears likely that Cena will be the first one to pick up a pinfall victory over the mighty Russian while Rusev will be made to look good under the bright lights of WrestleMania 31.

4) Daniel Bryan vs. Seth Rollins: This match would potentially steal the show and while rumors are minimal behind it, the WWE should put it on unless one of these two ends up in the main event.

Bryan is returning to action at the Royal Rumble later this month and has announced that he will be in the 30-man match while Rollins was added to the Lesnar vs. Cena bout, making it a Triple Threat Match.

"Mr. Money in the Bank" is unlikely to walk away with the gold at the Rumble since he still has the briefcase, so his plans for the "Show of Shows" remain up in the air.

As for Bryan, he has vowed to get his WWE Championship back and wants a match with Lesnar, but there are so many detractors of "The Beard" backstage within the WWE.

After falling just short in the Rumble Match, Bryan could very well challenge Rollins and convince him to put the briefcase on the line for some special added intrigue to this one-on-one contest.

It remains to be seen how the card will shake out for WrestleMania 31, but these bouts appear to be likely for the biggest show of 2015.

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