Steelers coach Mike Tomlin doesn't like what he sees -- or how the score wound up, with a 13-10 loss to the rival Baltimore Ravens on Sunday night. (US Presswire)

Blame it on Sunday night? It’s the Steelers’ worst prime time of the week. They have lost 18 of 37 times (.486 percentage) in Sunday night games compared to a 40-23 record (.635 percentage) on Monday nights.

Nah, the calendar wasn’t the reason why the Steelers lost 13-10 Sunday night to the visiting Baltimore Ravens, who scored on a punt-return touchdown and two field goals off Pittsburgh turnovers at Heinz Field. Defense wasn’t the reason why the Steelers lost, holding Ray Rice to 40 yards on 20 carries and Joe Flacco to 164 yards passing and the Baltimore offense overall to 3-of-14 conversions on third downs.

Somewhere between the offense and the injuries to said same, the Steelers fell to 6-4 for the season, they fell two games behind Baltimore in the AFC North race, and they fell into a murky area. Can they win enough games -- at Cleveland, at Baltimore, vs. San Diego, at Dallas, vs. Cincinnati, vs. Cleveland – to make the playoffs or not?

Offense: D+

The replacement for Ben Roethlisberger (shoulder), Byron Leftwich, started well with a nicely thrown deep ball that wound up a pass-interference penalty and a career-long, 31-yard run down the sideline for a broken-pass-play touchdown. Then ... kaput. Leftwich was battered and bruised (ribs), sacked three times and saddled with a 51.3 passer rating. He threw over receivers, he threw short -- including one after scrambling right in the final minute and launching one downfield to a wide-open David Gilreath behind the Ravens secondary, a sure game-winner if they had connected. The offense, however, wasn’t great around him. Jerrico Cotchery had as many penalties as catches. Mike Wallace was unable to get his feet in-bounds in the end zone for a touchdown and fumbled away a catch in the first quarter, leading to a Ravens field goal. Not until the second half did the offensive line begin to solve the Baltimore defense – 27th in the NFL against the run, 23rd against the pass. Jonathan Dwyer had 40 second-half yards on seven carries, and should’ve received more work. Rookie Mike Adams got abused with some regularity on right-edge pass protection, but perhaps Marcus Gilbert (foot) may return this week. And what if the injury-prone Leftwich awakes Monday hurting worse? Is it Charlie Batch’s time to replace an ailing Roethlisberger? Previous game’s grade: C-

Defense: B+

Rice, who rushed for 150 yards in two games against Pittsburgh last season, averaged Sunday night his lowest total (2.0 yards per) in the 57 games since his rookie season. Joe Flacco looked shaky in the pocket, passing for only 164 yards – less than half what he accumulated a week earlier in an Oakland rout. The Steelers, who lost starting defensive lineman Ziggy Hood (back) early in the game to join an already sidelined Troy Polamalu (safety), clamped down on Baltimore on 11 of 14 third-down conversion attempts. The one area where they failed yet again: zero takeaways. They have nine in nine games and a plus/minus of zero. If the Steelers are to survive however long they go Roethlisberger-less, the defense must conjure turnovers and win games for them. Previous game's grade: C-

Special teams: C

After improving on special teams, and even faring relatively well a week ago without Pro Bowl returner Antonio Brown (high ankle sprain), they gave up a Jacoby Jones punt return for a touchdown -- Baltimore’s only TD this night -- with just one Steeler barely putting so much as a hand on him. They saw Baltimore control field position with a few first downs and the foot of Sam Koch (42.5-yard net). They witnessed rookie Chris Rainey fail to gain the 20-yard line on two kickoff returns from the end zone. Same as last Monday night, they needed a boost from the special teams and never received one. Previous game’s grade: B

Coaching: C-

Dick LeBeau and the defensive coaches grade an A. But everybody else ... that's a different story. The offensive play selection for Leftwich wasn’t stellar, as the numbers bear out. The offense had a third-and-2 at the Baltimore 4, and, after rushing six times for 38 yards previously on that drive, the coaches called for an end-zone pass. The offense also had to expend two timeouts on back-to-back plays late in the third quarter. The offense scored one touchdown against the NFL’s No. 25 defense, one beleaguered by lesser teams. And the special teams didn’t work out so hot. So the Steelers had that going against them. Can the coaches prepare the Steelers for a 2-8 Cleveland team that possesses some young talent? Can they be in the proper mindframe to take a backup quarterback into Cleveland and then Baltimore? Previous game’s grade: C-

Follow Steelers reporter Chuck Finder on Twitter @CBSSteelers and @cfinder.