Seattle Times staff reporter Bob Condotta breaks down this week’s Seahawks opponent, the Baltimore Ravens.

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Game time: 10 a.m. Sunday.

TV: Fox (Ch. 13).

2015 record: 4-8, third in the AFC North.

By the numbers

-11 Baltimore’s turnover ratio, 31st in the NFL.

20 Players on injured reserve, most in the NFL according to Spotrac.com.

$16.838 million Salary-cap value of Baltimore’s players on injured reserve, also the most in the NFL according to Spotrac.com.

Coach: John Harbaugh.

The series: The teams have played just four times, with each winning two. The Seahawks have won the past two meetings, including 22-17 in 2011, the only game in the Pete Carroll era. The Seahawks have not played in Baltimore since 2003, a 44-41 loss.

Early line: Seahawks by 6.

Key players:

QB Matt Schaub: The veteran has taken over for regular starter Joe Flacco, who is out for the season because of a knee injury. Schaub was evaluated for a concussion in Sunday’s game against the Dolphins. But Harbaugh said Monday that Schaub is expected to play against the Seahawks. Though he threw for 308 yards against the Dolphins, he also threw an interception that was returned for a touchdown, the second “Pick 6” in his two starts this year.

RB Javorius Allen: A rookie from USC (and sometimes referred to as Buck), Allen has stepped into a regular role of late with starter Justin Forsett out for the season. Allen on Sunday rushed for 63 yards on 17 carries and had 107 yards receiving on 12 receptions.

WR Kamar Aiken: A third-year player from Central Florida, the 6-foot-2, 215-pound Aiken is having a breakout season. He has 30 receptions in the past five games after becoming the team’s No. 1 receiver once Steve Smith was lost due to injury.

LB Elvis Dumervil: The 31-year-old veteran remains a feared pass rusher, with six sacks for the season and 3½ in the past four games.

Baltimore’s keys to success: It’s been a tough season for a Ravens team used to winning — Baltimore has won 10 or more games six of the previous nine seasons. But injuries have derailed the Ravens this year. They rank 14th in total defense at 341.4 yards per game but have improved lately. Offensively, the Ravens boast a solid line led by right guard Marshal Yanda. But the skill-position losses have made it difficult to turn yards into points — the Ravens have not been a great red-zone team.