LONDON -- Baltimore Ravens quarterback Joe Flacco didn't just play the worst game of his career. His struggles rank among the worst in the NFL over the past decade.

In Sunday's 44-7 loss to the Jacksonville Jaguars, Flacco totaled a 0.8 QBR, the fifth-worst mark in the league since 2007. Total QBR is a calculation that factors in how credit should be divided among teammates, the down and distance on a quarterback's action plays, the strength of the opposing defense, the rushing contributions of a quarterback and whether plays occur in garbage time.

"I could probably go back through each drive and tell you what happened, but you saw it. It just is what it is," Flacco said. "We couldn’t complete a pass. We couldn’t keep any chunks and we couldn’t complete first downs. We left our defense on the field, and they were scoring touchdowns. Before you know it, the game is out of hand."

Whatever number you want to use, Flacco's performance was erratic, harried and the very opposite of elite. He finished 8-for-18 for 28 yards and threw two interceptions.

Even those statistics fail to represent Flacco's cringe-worthy day. These figures, however, put his game in better perspective:

His 28 passing yards were a career low and the fewest by any quarterback with at least 15 attempts in a game since Derek Anderson threw for 23 yards in 2009, according to ESPN Stats & Information. The next-worst passing yards total by a starting quarterback this year was by Brian Hoyer, who threw for 99 yards.

Flacco didn't complete a pass until midway through the second quarter, and that was to the Jaguars (an interception that led to Jacksonville's second touchdown of the game). His first connection with a Ravens receiver came four minutes before halftime.

Flacco's 8 yards passing in the first half tied for his fewest in the opening half of a game over his 10-year NFL career. This was the eighth time he has thrown for less than 35 yards in the first half, and all of those games resulted in losses.

Flacco didn't complete a pass that traveled more than 5 yards downfield, the first time in his career that has happened. He was 0-for-6 with two interceptions on such passes.

"[The Jaguars] have a good defense," Flacco said. "I’ve been saying that all week. They play fast, they play hard. They are strong, they’re physical. They create issues for a lot of teams. We weren’t able to get going early. I thought we could probably take some shots outside, but just weren’t able to get it done."

This type of a game shouldn't really be a surprise. Flacco was sidelined for all of training camp and the preseason because of a lower back injury. He didn't return to practice until eight days before the season opener, so you can make a case that he's in training camp mode for another week. Flacco has recently acknowledged that he's still not at full strength.

Joe Flacco's performance on Sunday was quantifiably bad. Kirby Lee/USA TODAY Sports

All of the blame can't be put on Flacco. With Marshal Yanda done for the season with an ankle injury, the Ravens have one remaining starter from last year (left tackle Ronnie Stanley) and the starting interior of the offensive line Sunday featured two undrafted rookies (guards James Hurst and Matt Skura) and a sixth-round pick (center Ryan Jensen). This factored into Flacco's getting pressured on eight of his 20 dropbacks.

An awful game like this will continue the narrative about how Flacco hasn't been the same since winning the Super Bowl in 2012. Over the last four-plus seasons, Flacco is tied for the fourth-most interceptions (43) and ranks 31st by averaging 6.7 yards per attempt.

On Sunday, Flacco will try to get back on track against a Pittsburgh Steelers defense that has totaled 11 sacks (second most in the league) and allowed only two touchdown passes.

"We’re all going to get back in there together and make this thing happen," Flacco said. "These losses can be lonely, but at the same time, we have a good team and we’re all going to go back in there and work on it together. That’s going to help us big-time."