NEW ORLEANS - The Florida Gators lounged around their hotel for two days, watching the NCAA tournament and waiting for their first-round game.

It may have caused them to be a little lethargic to start. Getting behind early helped them wake up.

The top-seeded Gators responded from a lackluster first half with the best half in school history and routed Jackson State 112-69 in the opening round Friday night.

“We’ve been ready for so long, and once we get out there, we were a little too antsy,” center Al Horford said. “We just had to settle down. Once we did that, we were fine.”

Corey Brewer led the defending national champions with 21 points, but it was another balanced effort from the team that returned all five starters from last season.

Joakim Noah had 17 points and 12 rebounds, Horford added 15 points and 16 boards, and Lee Humphrey sparked a huge run with four 3-pointers in the first 5 minutes of the second half.

Chris Richard came off the bench to finish with a career-high 17 points, and Taurean Green had a career-high 12 assists for Florida (30-5), which will play Purdue (22-11) on Sunday.

“I think we were a little amped up,” Brewer said. “You have a lot of energy going through you when it’s the NCAA tournament. We were ready to go. I think we were a little too ready. But we settled down, and I think we’ll be fine now.”

The Gators were clearly bigger, faster and more talented than the Tigers (21-14). However, they didn’t show it until after halftime.

But they really put on a show to start the second half — much like they did last year in the Final Four against George Mason and UCLA — and finished with a school-record 71 points after the break. The 71 points were more than 39 of the 65 tournament teams scored in the their entire first-round games.

Florida also ended with a 62-19 rebounding advantage — an NCAA tournament record.

MEN’S NCAA TOURNAMENT RESULTS Friday’s games SOUTH REGIONAL Memphis 73, North Texas 58 Virginia 84, Albany 57 Tennessee 121, Long Beach St. 86 Nevada 77, Creighton 71, OT MIDWEST REGIONAL UNLV 67, Georgia Tech 63 Winthrop 74, Notre Dame 64 Wisconsin 76, Texas A&M C.C. 63 Oregon 58, Miami of Ohio 55 Purdue 72, Arizona 63 Florida 112, Jackson State 69 WEST REGIONAL Kansas 107, Niagara 67 Virginia Tech 54, Illinois 52 Kentucky 67, Villanova 58 Southern Illinois 61, Holy Cross 51 EAST REGIONAL Texas 79, New Mexico State 67 Southern California 77, Arkansas 60

“I’ve never seen that before,” Gators coach Billy Donovan said.

Trey Johnson, the nation’s second-leading scorer, finished with 25 points on 8-of-21 shooting for Jackson State. Grant Maxey and Julius Young added 12 apiece.

“Their size and athleticism really wore us down in the second half,” Jackson State coach Tevester Anderson said. “In the first five minutes of the second half, they really turned it up on us. I don’t see any weaknesses in them. They pushed us around pretty good out there. It seemed like they got every loose ball and rebound.”

Humphrey got things started for Florida in the second half with a 3-pointer, Noah followed with a layup, then Brewer hit from behind the arc.

Jackson State called timeout in hopes of squashing Florida’s momentum, but it didn’t work. Humphrey drained another 3, Brewer sank a free throw and Noah’s putback capped a 17-6 spurt.

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The Gators weren’t done, either.

Humphrey hit another 3-pointer — and the beatdown was on.

Florida made 14 of its first 17 shots in the second half and manhandled the Tigers the rest of the way, looking very much like a team capable of becoming the first to repeat as national champions since Duke in 1992.

Jim Rogash / Getty Images The Week in Sports Pictures The nation grieved for those hurt, killed and affected by the Boston Marathon bombings. After one of the suspects was caught on Friday — following a day-long lockdown and manhunt — sports returned to Boston over the weekend.

“Just because we did things well today don’t mean that you’re going to do them the next game,” Noah said. “Teams are completely different. Right now is just all about the moment — focusing on the task.”

The Gators looked little like national champs in the opening half, which was wild and maybe a little scary for them.

Florida trailed by five early in the game and had plenty go wrong. The entire arena seemed to be rooting against the Gators. Noah turned his right ankle during a layup attempt, then squirmed around in pain before walking it off — surely causing Donovan a few anxious moments. And the Gators struggled to make baskets.