Seth Rollins is preparing for his biggest WWE World Heavyweight Championship defense this Sunday night against Brock Lesnar at Battleground and he had a message for the WWE Universe.

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The Architect took to Twitter to promote his upcoming battle with The Beast at Battleground this Sunday night live from the Scottrade Center in St. Louis.

"If you're not in STL this Sunday for Battleground you're wasting your life away," Rollins tweeted. "This is my WWE and I will not relinquish it for anything."

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Regarding the storyline around the match, with J&J Security out of action and Kane sustaining a storyline leg injury on Monday Night RAW this week, the idea is that Rollins is in it alone and that he won't have any backup when he faces Lesnar.

Rollins, of course, won the WWE World Heavyweight Championship by cashing in his Money in the Bank briefcase at WrestleMania 31 in March.

Lesnar was never pinned to lose the gold as Rollins made the main event a Triple Threat Match and pinned Roman Reigns to win the title.

Reigns will face Bray Wyatt at Battleground as he seeks vengeance for the Eater of Worlds costing him the Money in the Bank briefcase last month.

Here is the full updated card for Battleground this Sunday night:

WWE World Heavyweight Championship
Seth Rollins (c) vs. Brock Lesnar w/ Paul Heyman

WWE United States Championship
John Cena (c) vs. Kevin Owens

Singles Match
Roman Reigns vs. Bray Wyatt

WWE Intercontinental Championship Triple Threat Match
Ryback (c) vs. The Big Show vs. The Miz

WWE Tag Team Championships
The Prime Time Players (Darren Young & Titus O'Neil) (c) vs. The New Day (Combination of Kofi Kingston, Big E & Xavier Woods)

Singles Match:
Randy Orton vs. Sheamus

Pre-Show Match For King of the Ring Crown:
Bad News Barrett vs. R-Truth

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