The WWE's second biggest pay-per-view of the year is set to get under way Sunday evening.

SummerSlam 2012 is set to begin at 8 p.m. ET at the Staples Center in Los Angeles. You can watch a live stream of all the matches online at wwe.com by purchasing it for $44.95.

The event will be headlined by the match between Brock Lesnar and Triple H. The match has been building since April, when Lesnar broke Triple H's arm. Lesnar last fought at Extreme Rules, where he bloodied, but eventually lost to John Cena. Triple H hasn't stepped inside the ring since he lost to The Undertaker at WrestleMania XXVIII.

Shawn Michaels was supposed to be in Triple H's corner during the match, but he's no longer scheduled to be at the event after Lesnar broke his arm on Monday Night Raw.

There has been speculation that HBK will show up unannounced to help his friend, Hunter. There have also been rumors that HBK could unexpectedly super-kick Triple H to help Lesnar win. Doing so could set the stage for a fight between the two at WrestleMania XXIX.

The WWE championship will be up for grabs, as CM Punk defends his title against John Cena and Big Show. Punk is in the midst of one of the longest title runs in WWE history. He's held the belt since last November, and it's his first PPV match since his heel turn during Raw 1000.

Two other titles will be on the line in Los Angeles. Santino Marella will defend his United States Championship against Antonio Cesaro on the pre-show. Click here to watch a free live stream of the match.

Below is the lineup for the 2012 SummerSlam PPV, as well as predictions for all the matches:

Dolph Ziggler vs. Chris Jericho

Predicted Winner: Chris Jericho

Kane vs. Daniel Bryan

Predicted Winner: Kane

Tag Team Championship Match: Kofi Kingston/R-Truth vs. Prime Time Players

Predicted Winner: Kofi Kingston/R-Truth

Intercontinental Championship Match: The Miz vs. Rey Mysterio

Predicted Winner: The Miz

World Heavyweight Championship Match: Sheamus (c) vs. Alberto Del Rio

Predicted Winner: Sheamus

WWE Championship Match: CM Punk (c) vs. John Cena vs. Big Show

Predicted Winner: CM Punk

Brock Lesnar vs. Triple H

Predicted Winner: Brock Lesnar

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