JACKSONVILLE, Fla. — When the game started on Sunday, the temperature was 97 degrees with a heat index of 107. This marked the hottest game in both the Jaguars and Patriots history.

It was Jaguars who dealt with it best, delivering blow-after-blow to the reigning AFC champions. The Pats melted under the pressure.

The defense struggled to stop Blake Bortles (377 yards, four touchdowns) and an offense that played without its best player, Leonard Fournette. The Pats struggled to stop the Jags in the air and on the ground and especially on third down.

Tom Brady threw for 234 yards and two touchdowns but the offense rarely looked like the one most fans have come to know. In the end, the Patriots were out-matched and that resulted in a 31-20 loss.

“It’s a long year. I think [if] you have a bad day against a good team, that’s a recipe for losing,” Brady said. “We certainly had a bad day. We’ve got to learn from bad days. Things just don’t magically happen. You have to make them happen.”

Things weren’t happening for the Patriots in most areas on Sunday. On offense, the Pats were outgained by the Jags, 481 yards to 302. Jacksonville converted 71 percent of its third downs (10-for-14) to the Patriots 33 percent (4-for-12). Bortles outgunned Brady and the Jaguars running backs outgained the Patriots runners, 104-82.

Problems started from the get-go.

When the Patriots won the pre-game coin toss and Matthew Slater emphatically asked for the ball, it was a sign the Pats wanted get off to a fast start. Instead, the drive turned into a momentum push for Jacksonville as Stephon Gostkowski missed a 54-yard field goal at 11:49 of the first quarter.

Following the missed kick, Jacksonville took a 7-0 lead when hit Donte Moncrief beat Stephon Gilmore for a 4-yard touchdown at 7:52 of the quarter. The hot start for the Jags carried over to the next drive as the Patriots quickly went three-and-out. Before you could blink, Keelan Cole beat Eric Rowe on a 24-yard touchdown pass and the Patriots were down, 14-0.

“We weren’t able to sustain drives. Weren’t making enough plays,” New England receiver Chris Hogan said. “We were playing against a good football team and they took advantage of that.”

The offense put together a 16-play, 83-yard drive early in the second quarter, but stalled at the 10-yard line and had to settle for a 29-yard field goal by Gostkowski.

The Jaguars responded with a 75-yard drive that culminated with a Bortles' pass to a wide-open Austin Seferian- Jenkins for a 4-yard touchdown with nine seconds left in the half. The Patriots went into the locker rooms with no sacks and no quarterback hits and trailing, 14-3.

Before the second half started, both Trey Flowers and Patrick Chung were ruled out because of concussions. Despite missing those key pieces, the Pats defense, showed improvement in the second half. It gave up a field goal early, but then locked down Bortles and forced two turnovers and a three-and-out in the next three series.

After the Jaguars' field goal, the Pats offense went three-and-out. But a Jacksonville fumble helped get the Pats going and Brady hit Hogan with a 7-yard touchdown pass. The Pats trailed, 24-10, with 1:47 left in the third quarter.

After the Jags had another three-and-out, the Pats threatened but settled for another Gostkowski field goal and it was 24-13 with 14:10 remaining.

Next, Kyle Van Noy intercepted Bortles. The offense took over at the 25-yard line. Instead of taking the momentum and running with it, Brady was strip-sacked by Dante Fowler at 12:35 with Fowler pouncing on the loose ball.

“Just made too many mistakes as an offense,” Patriots running back James White said. “We just have to find a way to start faster, be on the same page from the start. We didn’t start fast. They did. Can’t do that on the road.”

Another Patriots defensive stand gave the offense the ball back with 9:47 to go, but again it went three-and-out. On the first play of the next drive, Bortles hit Dede Westbrook with a pass that went 61 yards for a touchdown with 7:48 remaining to make it 31-13.

“We didn’t do a good enough job in any area,” Bill Belichick said. “It’s a long list — playing, coach, every part of the game. It just wasn’t good enough.”

With 3:48 left in the game, Brady hit Hogan for a 29-yard touchdown.

But the effort was too little, too late.

“You’ve got to make improvement. I think September, October, that’s what it’s for,” Brady said. “I think there’s a lot of practice we need and lot of time we need to figure out what we do well and what we don’t do so well.

“You have to try to win in the meantime. Today obviously wasn’t good enough.”