Offensively is where the Texans have surprised the most.

Revamped during the offseason, Houston brought in a new starting quarterback (Brock Osweiler), a new starting running back (Lamar Miller), and drafted wideout Will Fuller in the first round of the 2016 draft to ride shotgun to Pro Bowl receiver DeAndre Hopkins.

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Osweiler, who started seven games for the Super Bowl champion Denver Broncos last season, has 499 yards this season with a league-leading 74.3 percent of those yards coming in the air, which is a direct reflection of adding Fuller to the mix.

Having a deep threat like Fuller on the roster helps open up space for Hopkins, who has slightly increased his yards per route run from one year to the next (2.28 in 2015 vs. 2.29 in 2016).

The biggest problem for Osweiler and the Texans’ passing game are the interceptions. Two of his three picks this season have come on the opening drive, one of them a costly red-zone mistake.

The running game also has room for improvement despite the addition of Miller. The former member of the Miami Dolphins has 189 yards on 53 carries but is only averaging 1.83 yards per carry after contact (No. 11 of 13 running backs getting at least half their team’s attempts), and he has no runs better than 15 yards.

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Miller did manage to produce 45 yards on 12 carries in the fourth quarter against the Chiefs, perhaps a sign of better things to come.

“The fourth quarter, we had to get some tough yards to keep the ball moving and keep the chains moving,” Miller said after the game. “I was trying to do a good job of being decisive and hitting the hole. I think I was trying to set up the linebackers because they overflow. Sometimes, I’ve got to be decisive and just hit the hole.”

The defense, however, is as solid as ever. They are yielding just 1.04 points per drive (No. 3 in NFL) and allow an offense to have the ball for less than two minutes per drive. Their rush defense could use some improvement (4.9 yards allowed per carry, No. 29 in league) but they make up for it with the second-lowest net yards allowed per pass attempt (4.8).

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Part of that pass defense is a stellar pass rush. In Week 1 against the Chicago Bears, the Texans pressured Jay Cutler on 19 of his 35 drop backs limiting him to a 50 percent completion rate with five sacks and an interception. In Week 2 against the Kansas City Chiefs, Houston pressured Alex Smith on 16 of his 42 drop backs, holding him to four completions on 12 attempts for 35 yards and four sacks.

Leading the charge, of course, is their Pro Bowl defensive end, J.J. Watt.

Watt, who was playing in his second game back after two offseason surgeries on Sunday, had his first sack and fumble recovery of the season, finishing the game with 1 1/2 sacks, four solo tackles and a assist, plus two quarterback hurries. And Watt might not have been the best defensive player on a team that registered five sacks and 10 pressures to along with 15 total stops at or behind the line of scrimmage. According to the game charters at Pro Football focus, that honor goes to outside linebacker John Simon, who led the team in Week 2 with three total stops (two of them sacks) and eight total pressures.

All that is standing in their way of a third consecutive win are the undefeated New England Patriots, who will likely have to turn to third-string quarterback Jacoby Brissett with Tom Brady still serving a suspension and Jimmy Garoppolo nursing a shoulder injury.

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Brissett did enough to not lose the game against Miami in Week 2, but it was clear the coaching staff didn’t want him to do too much, limiting him to nine passes that averaged 1.1 yards past the line of scrimmage.

Even with the quarterback switch, FiveThirtyEight’s NFL forecast gives the Texans just a 30 percent chance at keeping their perfect record.