Championship side Birmingham City left it late to see off League Two newcomers Cambridge United to reach the Capital One Cup second round.

Lee Clark's side took the lead through unmarked striker Clayton Donaldson before namesake Ryan Donaldson equalised for the Us.

After a goalless second half Blues defender Paul Caddis hit home a rebound in the first period of extra-time.

Midfielder Mark Duffy then sealed victory with a well-struck third.

Birmingham City manager Lee Clark told BBC WM:

Lee Clark on Birmingham's win

"It was a really good game, I thought. I told the players it would be extremely tough, and I was proved to be correct.

"We've had some really good individual performances. I thought the midfield pairing of Paul Caddis and David Davis looked very energetic, very powerful, and David Cotterill was very good.

"Davis showed his character and determination to keep going for the full 120 minutes, and I think you've seen we've got a good player.

"I made seven changes, but I wasn't taking liberties or showing Cambridge disrespect, I was giving some of the lads a chance to stake a claim, and some of them have done that."

Lineup, Bookings (1) & Substitutions (6)

Birmingham City

  • 21 Doyle
  • 31 Caddis
  • 03 Grounds
  • 26 Davis Booked
  • 05 Gunning (Edgar - 38' )
  • 15 Hall
  • 11 Cotterill
  • 23 Spector
  • 10 Thomas (Novak - 63' )
  • 09 Donaldson
  • 33 Gray (Duffy - 75' )

Substitutes

  • 01 Randolph
  • 06 Edgar
  • 07 Duffy
  • 08 Gleeson
  • 12 Novak
  • 17 Reilly
  • 29 Brown

Cambridge United

  • 01 Dunn
  • 02 Tait
  • 03 Taylor
  • 08 Champion
  • 05 Bonner
  • 04 Coulson
  • 07 Donaldson
  • 17 Hughes
  • 21 Appiah (Simpson - 83' )
  • 09 Cunnington (Sam-Yorke - 45' )
  • 11 Dunk (Chadwick - 69' )

Substitutes

  • 13 Norris
  • 14 Hunt
  • 15 Simpson
  • 16 Austin
  • 19 Sam-Yorke
  • 22 Chadwick
  • 25 Lennon
Ref: Tim Robinson
Att: 9,816

Match Stats

Shots

22 15

On target

7 10

Corners

9 8

Fouls

15 9

Live Text Commentary

Full time

Full Time Match ends, Birmingham City 3, Cambridge United 1.

120:00 +3:06

Second Half Extra Time ends, Birmingham City 3, Cambridge United 1.

120:00 +0:26

Foul by Clayton Donaldson (Birmingham City).

120:00 +0:26

Liam Hughes (Cambridge United) wins a free kick on the left wing.

115:51

Attempt saved. Robbie Simpson (Cambridge United) right footed shot from outside the box is saved in the bottom left corner.

114:26

Delay over. They are ready to continue.

114:24

Delay over. They are ready to continue.

113:04

Delay in match David Edgar (Birmingham City) because of an injury.

111:32

Jonathan Grounds (Birmingham City) wins a free kick in the attacking half.

111:32

Foul by Robbie Simpson (Cambridge United).

109:28

Attempt missed. Greg Taylor (Cambridge United) header from the centre of the box misses to the left.

108:28

Corner, Cambridge United. Conceded by Colin Doyle.

108:17

Attempt saved. Greg Taylor (Cambridge United) header from the centre of the box is saved in the top right corner.

105:00

Second Half Extra Time begins Birmingham City 3, Cambridge United 1.

106:34

First Half Extra Time ends, Birmingham City 3, Cambridge United 1.

105:21 Goal scored

Goal! Goal! Birmingham City 3, Cambridge United 1. Mark Duffy (Birmingham City) right footed shot from the right side of the box to the bottom left corner. Assisted by Colin Doyle.

102:48

Foul by Lee Novak (Birmingham City).

102:48

(Cambridge United) wins a free kick in the attacking half.

102:20

Corner, Birmingham City. Conceded by Chris Dunn.

102:11

Attempt saved. David Cotterill (Birmingham City) right footed shot from the left side of the box is saved in the bottom right corner.

101:36

Corner, Cambridge United. Conceded by Grant Hall.

101:00

Attempt missed. Grant Hall (Birmingham City) header from the centre of the box misses to the left.

100:25

Corner, Birmingham City. Conceded by Tom Champion.

99:59

Corner, Birmingham City. Conceded by Luke Chadwick.

99:46

Attempt blocked. Paul Caddis (Birmingham City) right footed shot from outside the box is blocked.

99:15

Paul Caddis (Birmingham City) wins a free kick in the attacking half.

99:15

Foul by Delano Sam-Yorke (Cambridge United).

98:05

Attempt missed. Greg Taylor (Cambridge United) header from the centre of the box misses to the left.

97:44

Corner, Cambridge United. Conceded by David Cotterill.

97:06

Foul by Mark Duffy (Birmingham City).

97:06

Ryan Donaldson (Cambridge United) wins a free kick in the defensive half.

96:31

Corner, Cambridge United. Conceded by Grant Hall.

95:26 Goal scored

Goal! Goal! Birmingham City 2, Cambridge United 1. Paul Caddis (Birmingham City) right footed shot from the centre of the box to the bottom left corner.

93:55

Attempt missed. David Cotterill (Birmingham City) right footed shot from outside the box is just a bit too high.

93:00

Luke Chadwick (Cambridge United) wins a free kick in the defensive half.

92:57

Foul by Grant Hall (Birmingham City).

90:00

First Half Extra Time begins Birmingham City 1, Cambridge United 1.

90:00 +3:56 Full time

Full Time Second Half ends, Birmingham City 1, Cambridge United 1.

90:00 +3:09

Hand ball by Grant Hall (Birmingham City).

90:00 +1:17

Attempt missed. Clayton Donaldson (Birmingham City) header from very close range is close, but misses to the right.

90:00 +0:38

David Davis (Birmingham City) wins a free kick in the defensive half.

90:00 +0:38

Foul by Tom Champion (Cambridge United).

88:43

Attempt saved. Mark Duffy (Birmingham City) right footed shot from outside the box is saved in the top right corner.

88:02

Corner, Birmingham City. Conceded by Josh Coulson.

87:38

David Edgar (Birmingham City) wins a free kick on the left wing.

87:38

Foul by Luke Chadwick (Cambridge United).

86:48

Corner, Birmingham City. Conceded by Tom Champion.

84:54

Corner, Birmingham City. Conceded by Greg Taylor.

82:34 Substitution

Substitution Substitution, Cambridge United. Robbie Simpson replaces Kwesi Appiah.

82:18

Attempt missed. David Cotterill (Birmingham City) right footed shot from outside the box is high and wide to the right.

81:28

Attempt blocked. Paul Caddis (Birmingham City) right footed shot from the centre of the box is blocked.

79:31

David Davis (Birmingham City) wins a free kick in the defensive half.

79:31

Foul by Kwesi Appiah (Cambridge United).

77:03

Attempt missed. David Cotterill (Birmingham City) right footed shot from outside the box misses to the right from a direct free kick.

76:16

Mark Duffy (Birmingham City) wins a free kick in the attacking half.

76:16

Foul by Tom Champion (Cambridge United).

74:16 Substitution

Substitution Substitution, Birmingham City. Mark Duffy replaces Demarai Gray.

72:31

Attempt missed. Luke Chadwick (Cambridge United) right footed shot from outside the box is just a bit too high.

71:00

Kwesi Appiah (Cambridge United) wins a free kick in the defensive half.

70:57

Foul by David Edgar (Birmingham City).

70:22

Attempt saved. Demarai Gray (Birmingham City) right footed shot from the centre of the box is saved in the bottom left corner.

68:50

Clayton Donaldson (Birmingham City) wins a free kick on the right wing.

68:50

Foul by Tom Champion (Cambridge United).

68:33 Substitution

Substitution Substitution, Cambridge United. Luke Chadwick replaces Harrison Dunk.

67:30

Corner, Birmingham City. Conceded by Josh Coulson.

66:25

Corner, Birmingham City. Conceded by Tom Bonner.

65:33

Attempt missed. Clayton Donaldson (Birmingham City) left footed shot from the centre of the box misses to the right.

64:03 Booking

Booking David Davis (Birmingham City) is shown the yellow card.

63:52

Foul by David Davis (Birmingham City).

63:52

Delano Sam-Yorke (Cambridge United) wins a free kick on the right wing.

62:54 Substitution

Substitution Substitution, Birmingham City. Lee Novak replaces Wes Thomas.

62:40

Corner, Birmingham City. Conceded by Richard Tait.

57:45

Attempt saved. Delano Sam-Yorke (Cambridge United) right footed shot from outside the box is saved in the bottom left corner.

56:47

Attempt blocked. Paul Caddis (Birmingham City) left footed shot from a difficult angle on the right is blocked.

56:00

Ryan Donaldson (Cambridge United) wins a free kick on the right wing.

55:57

Foul by David Davis (Birmingham City).

51:26

Foul by Grant Hall (Birmingham City).

51:26

Kwesi Appiah (Cambridge United) wins a free kick in the attacking half.

50:22

Foul by Jonathan Spector (Birmingham City).

50:22

Kwesi Appiah (Cambridge United) wins a free kick in the attacking half.

47:11

Corner, Cambridge United. Conceded by Colin Doyle.

46:58

Attempt saved. Josh Coulson (Cambridge United) header from the centre of the box is saved in the top right corner.

46:38

Corner, Cambridge United. Conceded by Colin Doyle.

46:24

Attempt saved. Ryan Donaldson (Cambridge United) right footed shot from a difficult angle on the right is saved in the top right corner.

45:22

Foul by Grant Hall (Birmingham City).

45:22

Kwesi Appiah (Cambridge United) wins a free kick in the defensive half.

45:00

Second Half begins Birmingham City 1, Cambridge United 1.

45:00 Substitution

Substitution Substitution, Cambridge United. Delano Sam-Yorke replaces Adam Cunnington.

45:00 +4:01 Half time

Half Time First Half ends, Birmingham City 1, Cambridge United 1.

45:00 +3:36

Attempt saved. Kwesi Appiah (Cambridge United) header from a difficult angle on the left is saved in the top right corner.

45:00 +3:10

Foul by Paul Caddis (Birmingham City).

45:00 +3:10

Liam Hughes (Cambridge United) wins a free kick in the attacking half.

45:00 +0:45

Foul by Clayton Donaldson (Birmingham City).

45:00 +0:45

Tom Champion (Cambridge United) wins a free kick in the attacking half.

41:21

Attempt missed. Kwesi Appiah (Cambridge United) right footed shot from the right side of the box misses to the left.

38:00 Substitution

Substitution Substitution, Birmingham City. David Edgar replaces Gavin Gunning because of an injury.

37:04 Goal scored

Goal! Goal! Birmingham City 1, Cambridge United 1. Ryan Donaldson (Cambridge United) left footed shot from outside the box to the bottom left corner.

34:27

Corner, Cambridge United. Conceded by Colin Doyle.

33:39

Foul by David Davis (Birmingham City).

33:39

Kwesi Appiah (Cambridge United) wins a free kick in the defensive half.

33:07

Attempt saved. David Davis (Birmingham City) right footed shot from outside the box is saved in the bottom left corner.

32:50

Attempt blocked. Clayton Donaldson (Birmingham City) left footed shot from the right side of the six yard box is blocked.

31:10

Corner, Cambridge United. Conceded by Jonathan Grounds.

30:28

Attempt missed. Clayton Donaldson (Birmingham City) right footed shot from outside the box is close, but misses to the left.

23:49

Attempt missed. Wes Thomas (Birmingham City) header from the centre of the box is close, but misses to the right.

21:00

David Davis (Birmingham City) wins a free kick in the attacking half.

20:57

Foul by Kwesi Appiah (Cambridge United).

15:51 Goal scored

Goal! Goal! Birmingham City 1, Cambridge United 0. Clayton Donaldson (Birmingham City) right footed shot from the centre of the box to the bottom right corner. Assisted by Paul Caddis with a cross.

14:14

Attempt blocked. Demarai Gray (Birmingham City) right footed shot from a difficult angle on the right is blocked.

13:30

Attempt blocked. Adam Cunnington (Cambridge United) right footed shot from very close range is blocked.

13:08

Attempt saved. Kwesi Appiah (Cambridge United) right footed shot from outside the box is saved in the bottom left corner.

9:28

Attempt missed. David Cotterill (Birmingham City) right footed shot from the left side of the box misses to the right.

8:38

Attempt saved. Adam Cunnington (Cambridge United) right footed shot from the centre of the box is saved in the centre of the goal.

7:43

Attempt saved. Harrison Dunk (Cambridge United) right footed shot from outside the box is saved in the centre of the goal.

6:12

Foul by Harrison Dunk (Cambridge United).

6:12

Paul Caddis (Birmingham City) wins a free kick in the attacking half.

5:08

Attempt missed. Demarai Gray (Birmingham City) left footed shot from outside the box misses to the right.

1:12

Kwesi Appiah (Cambridge United) wins a free kick in the defensive half.

1:12

Foul by Gavin Gunning (Birmingham City).

0:00

First Half begins.

0:00

Lineups are announced and players are warming up.

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