Bears quarterback Mitch Trubisky eyes Rams after they forced worst performance of his career last season

At this time last week, Bears quarterback Mitch Trubisky watched game film from 2018 and found reasons to be confident. His home performance against the Lions last season was probably the best game of his career. He went 23-for-30 for 355 yards, three touchdowns and a 148.6 passer rating.

The Bears’ opponent Sunday also gave him 2018 film to research. The Rams-Bears game took place five weeks after that game against the Lions — in Week 14 — but the result was different. The Rams forced Trubisky into the worst game of his career.

Returning from a shoulder injury, Trubisky went 16-for-30 for 110 yards, a touchdown and three interceptions in the Bears’ 15-6 victory at Soldier Field. His 33.3 passer rating in that game remains the lowest of his career.

For all the talk in recent weeks about building up his confidence — from talking to old coaches to watching TV tape to watching film from last season — the fastest way for Trubisky to feel his best would be to beat the Rams on Sunday in Los Angeles.

‘‘Last year, [the Rams] kind of zoned us out and tried to keep everything in front and kind of take away our big plays,’’ Trubisky said Wednesday. ‘‘So for us it’s just gonna be being good on first and second down, trying to establish drives, stay on the field.’’

In a particularly dry news conference, Trubisky used the phrase ‘‘do my job’’ four times.

‘‘We’ve got to find ways to score more points,’’ he said. ‘‘They did a good job of keeping us out of the end zone and made us settle for some field goals last year, so we’d like to find ways to punch it in and, when we get into the red zone, finish drives. So that’s gonna be the focus.’’

Only four Rams defenders that started against the Bears last season were in the starting lineup Sunday against the Steelers, but defensive tackle Aaron Donald — the reigning NFC Defensive Player of the Year — is one of them. The Rams have added big-name veterans, such as outside linebacker Clay Matthews, safety Eric Weddle and cornerback Jalen Ramsey, to a unit they hoped could help them get back to the Super Bowl.

The Rams have proved to be merely average defensively, though: Their 21.2 points per game allowed are tied for 15th in the league. Still, they’re worlds better than the defense the Bears faced Sunday.

Nonetheless, the Bears’ 20-13 victory Sunday against the Lions — ugly though it might have been against the second-worst defense in the league — was a weight off Trubisky’s shoulders.

‘‘It did it for all of us,’’ coach Matt Nagy said. ‘‘[We] just feel like, OK, we know there’s gonna be good wins, there’s gonna be sloppy wins. But in the end, when we look back at that game, we’ll remember how it kind of went. But really, in the end, we got the win. And it feels good to get that win.

‘‘Do we want to be better? Do we know that we have a lot higher grades and values for how we play? Yes. But I think all of us, including Mitch, feel a lot better. And the confidence, definitely, certainly gets higher.’’

The standard has been lowered, too. Nagy’s insistence that Trubisky played four quality quarters against the Lions, even though the Bears punted nine times, says as much.

Trubisky has a little bit of momentum, though, heading into the game against the Rams.

‘‘I think we’re not exactly where we want to be yet,’’ Trubisky said. ‘‘But a win definitely gives you confidence moving forward.’’