Birmingham City made it five games unbeaten in the Championship with an impressive 3-0 win over QPR.

In-form Liam Millar scored in both halves for Blues before substitute Demarai Gray's stoppage-time effort sealed a third straight win for Chris Davies' side.

Only goal difference separated the teams before the game but QPR, themselves unbeaten in five heading to the West Midlands, offered little to preserve that run.

Birmingham stay in fourth place as their strong start to the season continues, while the R's slip out of the play-off places to ninth.

The visitors wasted a huge chance to take the lead inside the opening 10 minutes when defender Boy Kemper failed to connect with a flick-on from a long throw at point-blank range.

With chairman Tom Wagner watching on, Blues started confidently after Tuesday's 4-0 win over Preston and their speedy attack was in full force when the in-form Millar gave them the lead following a counter.

Millar, on loan from Hull, found the bottom corner for his second goal in as many games after he was sent through one-on-one after 27 minutes.

Blues needed just four second-half minutes to double their lead, with Millar again finding the net after finishing another breakaway move.

Home goalkeeper James Beadle was forced into action just after the hour mark to tip an effort from Ronnie Edwards around the post as the R's enjoyed their first sustained spell of pressure in the match.

At the other end, Millar might have had his hat-trick but fired straight at QPR keeper Pierce Charles when well placed.

His replacement Gray wrapped up another good day at the office for Blues when he blasted the ball high into the net from close range late on.

Birmingham City boss Chris Davies told BBC Radio WM: "I said to the players before the game: 'It's been a good week and good teams would be happy with that, but we want to make it a great week'.

"That's what we focused on and I thought there was a real intensity about us today.

"I knew it would be a tough game. QPR, they came with a plan, but the way we started and finished we just had too much for them and I was really pleased with the performance.

"We played some good football today. What I didn't want to do is go up in the lead and almost panic and be scared by that. I thought we showed a much better development in our game than, for example, the Middlesbrough game."

QPR boss Julien Stephan told Radio London: "It's a tough result for us. I think we started the game well, the first 10 to 15 minutes we did very well and the first situation we had - the long throw - we had a huge, huge situation to take the lead, and we know how important it is in these types of games to take the lead.

"I'm disappointed more with how we conceded the first goal. It's a little bit of a lack of maturity in this situation. Today we concede three goals on transition, it's really unusual for us.

"Probably we concede more in one game than the last 10 games. This is the story of the game.

"We wanted to start strongly second half and we concede immediately the second goal. The players never gave up but probably we face an opponent today better than us in some details, more fresh than us as well - they had one more day to recover."