With WWE Fastlane in the rearview mirror, the end of the road to WrestleMania 31 is drawing near.

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The biggest show of the year will emanate live from Levi's Stadium in Santa Clara, Calif. on March 29 and while some matches have been made official, there is plenty of room to play with on the card.

Roman Reigns overcame Daniel Bryan Sunday night at Fastlane live from the FedEx Forum in Memphis and it is now confirmed that the 2015 Rumble Match winner will battle Brock Lesnar for the WWE World Heavyweight Championship at WrestleMania 31.

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It was also revealed that Triple H and Sting will take their rivalry into the squared circle at the "Show of Shows" as "The Vigilante" will wrestle his first WWE match ever against "The Game."

With those matches etched in stone, here are five more possible matches that have yet to be made official for the WrestleMania 31 card:

1) Daniel Bryan vs. Dolph Ziggler: Now that it's official that Bryan won't be in the main event of WrestleMania for the second straight year, the WWE is back to square one with him.

Before the WWE changed its plans for Fastlane this month, Ziggler and Bryan were campaigning on social media for a match against each other and the WWE's website even picked up on the story.

With Bryan losing to Reigns, he is now once again free to battle Ziggler at the "Show of Shows," so it seems logical that the WWE will head in that direction again.

If given enough time, "The Showoff" and "The Beard" -- two men that have a lot of support from the WWE Universe but are often booked questionably by WWE creative -- have the potential to steal the show.

2) Randy Orton vs. Seth Rollins: "The Viper" made his return following a six-man opening tag team match at Fastlane on Sunday night, going after "Mr. Money in the Bank" and his teammates Kane and The Big Show.

Rollins was able to escape through the crowd, but it appears he's set to take on Orton come WrestleMania as there is a score to be settled between the two Superstars.

Rollins, Triple H and Kane beat down Orton to write him off of television in November, but he's back now and it's likely the two are set for a collision course ending at WrestleMania 31.

3) Bray Wyatt vs. The Undertaker: This is a pretty obvious one as Wyatt came out in a coffin flanked by druids at Fastlane and called 'Taker out.

There were plenty of questions over whether The Undertaker would be at WrestleMania this year after being injured and losing The Streak to Brock Lesnar last year, but now that Wyatt has called him out on television it's all but official.

"The Eater of Worlds" has been cutting cryptic promos as of late and while many speculated that he was alluding to "The Deadman," it wasn't made official until Sunday night.

While this match would be a lot more intriguing with The Streak still intact, it should still be a solid affair with phenomenal buildup over the next five weeks.

'Taker has yet to respond, so as it stands the match isn't official just yet.

4) Dean Ambrose vs. Bad News Barrett (c) in a Ladder Match for the Intercontinental Championship: These two also went toe-to-toe at Fastlane, but the match concluded with a disqualification finish after the "Lunatic Fringe" wouldn't listen to the referee.

Barrett played the role of chicken heel perfectly in the bout and it should lead to another clash between the two at WrestleMania.

Another interesting thing to note is that Ambrose ended up leaving with Barrett's title despite not winning it.

The WWE could pull a page from the Razor Ramon and Shawn Michaels book by having Ambrose refuse to give the belt back, leading to Barrett bringing in a second belt to carry around.

The two could then settle the score by having both belts hang above the ring in a Ladder Match at WrestleMania where disqualifications won't be an issue.

The WWE has ignored the Intercontinental Championship at WrestleMania way too many times over the years and this would be a nice way to make the title stand out.

5) Rusev (c) vs. John Cena for the United States Championship: The mighty Russian got a huge career-making win over the "Cenation" leader Sunday night at Fastlane, but it seems this rivalry is far from over.

With Cena being the top babyface in the company, Rusev's win didn't come without controversy as he hit a low blow on Cena before kicking him in the face and making him pass out to the Accolade.

As usual, Cena won't be going down without a fight and it is likely these two cross paths again next month, where Cena may get the win to get his heat back.

A win for Rusev over Cena would have been bigger at a show like WrestleMania, but the WWE unfortunately opted to move the match up to the February event, meaning it's likely that the Russian will lose to Cena at the "Show of Shows."

It is possible, however, that Rusev could have another big win up his sleeve.

This feud makes the United States Championship feel important, which is good for everyone involved.

The WWE presents WrestleMania 31 live from Levi's Stadium in Santa Clara, Calif. on March 29.

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