David Nugent's first-half strike gave Portsmouth victory over Leicester and dented the Foxes' play-off hopes.
Former Pompey striker Yakubu headed Paul Gallagher's cross wide from six yards before the visitors struck.
Souleymane Bamba's defensive header landed at Nugent's feet and he fired into the bottom corner from 12 yards.
Bamba, Gallagher and Liam Lawrence all had chances and Leicester saw a penalty appeal rejected, before Joel Ward wasted an opening for Pompey late on.
Nugent's 11th league goal of the season provided Portsmouth with a welcome away win which moves them to a point behind Leicester in mid-table.
With eight games remaining, Leicester stand five points outside the play-offs.
The hosts dominated for large periods of the game but could not find an equaliser as a dogged defensive performance from Portsmouth saw Steve Cotterill's men claim their eighth clean sheet in nine matches.
Leicester started the brighter of the two teams as Hermann Hreidarsson almost turned Richie Wellens' cross into his own net inside the first five minutes.
Yakubu should have put the Foxes ahead after 10 minutes but failed to convert Gallagher's teasing centre.
The visitors opened the scoring against the run of play when Bamba's poor clearance fell to Nugent and he slotted home.
Bamba then almost redeemed himself but the Ivorian's header was parried away by Jamie Ashdown while Gallagher shot wide from 25 yards as the home side looked for an equaliser.
Lawrence cracked a 25-yard free-kick just wide of Ricardo's goal before Gallagher failed to direct another shot on target after smart work from Yakubu.
Yakubu had a penalty shout waved away by referee Paul Tierney on the stroke of half-time, while Bamba sent a header off target.
Sven-Goran Eriksson's side were infuriated when Gallagher's free-kick looked to have hit a visiting player's hand but again Tierney waved away the protests.
The dangerous Yakubu shot wide from long distance as Leicester took the game to their opponents and Gallagher wasted another opportunity when one-on-one with Ashdown.
Eriksson threw on Lloyd Dyer and Martyn Waghorn to try to find an equaliser but it was Portsmouth who had the best chance 10 minutes from time, Ward fluffing his finish from close range after Bamba looked for an offside flag.
Ashdown denied Leicester an equaliser late on when he superbly parried away a long-range Kyle Naughton strike, and a fine cross from on-loan defender Jeffrey Bruma fizzed across the face of the goal without a home player managing to get anything on it.
Live text and stats
Saturday, 19 March 2011
22 Abe (Dyer 61)
37 Vassell (Waghorn 68)
05 Miguel Vitor,
05 De Laet
14 Hogg yellow card
17 Cotterill (Ward 64)
10 Nugent yellow card (Dickinson 74 yellow card)
Ref: TierneyAtt: 26,645
Attempts on target
Attempts off target
90:00+4:06 The game is over, as the referee blows his whistle.
90:00+1:47 Ben Mee gives away a free kick for an unfair challenge on Jonathan Hogg. Free kick taken by Jamie Ashdown.
90:00+0:52 Martyn Waghorn challenges Dave Kitson unfairly and gives away a free kick. Hayden Mullins restarts play with the free kick.
90:00+0:13 Centre by Kyle Naughton, Andy King has a headed effort at goal from just inside the box that misses to the right of the goal.
87:51 Effort on goal by Martyn Waghorn from long range goes over the crossbar.
86:04 Corner taken right-footed by Paul Gallagher from the left by-line, Jeffrey Bruma crosses the ball.
85:50 Ayegbeni Yakubu takes a short corner.
83:50 Paul Gallagher takes a corner.
83:36 Effort on goal by Kyle Naughton from 20 yards. Save made by Jamie Ashdown.
82:42 Effort on goal by Ayegbeni Yakubu from just inside the box goes harmlessly over the target.
81:31 Close range shot by Joel Ward goes wide of the right-hand upright.
80:41 Carl Dickinson challenges Kyle Naughton unfairly and gives away a free kick. Kyle Naughton restarts play with the free kick.
80:41 Booking Carl Dickinson receives a yellow card for dissent.
79:48 Free kick awarded for an unfair challenge on Souleymane Bamba by Joel Ward. Ricardo Pereira takes the direct free kick.
77:59 Dave Kitson is caught offside. Ricardo Pereira takes the free kick.
77:35 Richie Wellens concedes a free kick for a foul on Joel Ward. Direct free kick taken by Greg Halford.
77:11 Ritchie De Laet sends in a cross, Dave Kitson has a headed effort at goal from just inside the penalty area that misses to
the right of the goal.
75:53 Free kick awarded for an unfair challenge on Liam Lawrence by Ben Mee. Free kick taken by Jamie Ashdown.
73:15 Substitution Carl Dickinson replaces David Nugent.
72:26 Inswinging corner taken from the left by-line by Paul Gallagher, save by Jamie Ashdown.
69:46 Free kick awarded for an unfair challenge on Richie Wellens by Hayden Mullins. Paul Gallagher produces a shot on goal direct
from the free kick.
67:58 Free kick awarded for an unfair challenge on Greg Halford by Darius Vassell. Jamie Ashdown restarts play with the free kick.
67:58 Substitution Darius Vassell leaves the field to be replaced by Martyn Waghorn.
66:00 Jonathan Hogg fouled by Paul Gallagher, the ref awards a free kick. Greg Halford takes the free kick.
64:43 Inswinging corner taken by Paul Gallagher.
64:24 Dave Kitson challenges Jeffrey Bruma unfairly and gives away a free kick. Kyle Naughton takes the free kick.
63:22 Paul Gallagher takes a shot. Save made by Jamie Ashdown.
63:22 Substitution Joel Ward comes on in place of David Cotterill.
60:13 Substitution Lloyd Dyer joins the action as a substitute, replacing Yuki Abe.
58:34 Dave Kitson is ruled offside. Ricardo Pereira restarts play with the free kick.
55:52 Free kick awarded for a foul by Liam Lawrence on Yuki Abe. Kyle Naughton takes the free kick.
52:09 Foul by Ritchie De Laet on Andy King, free kick awarded. Direct effort from the free kick comes in from Paul Gallagher.
51:04 The referee blows for offside. Indirect free kick taken by Jamie Ashdown.
49:41 Free kick awarded for a foul by Greg Halford on Paul Gallagher. Free kick crossed right-footed by Paul Gallagher from left
48:41 The referee blows for offside against Andy King. Indirect free kick taken by Jamie Ashdown.
46:28 Free kick awarded for an unfair challenge on Ricardo Rocha by Ayegbeni Yakubu. Free kick taken by Greg Halford.
45:29 Yuki Abe gives away a free kick for an unfair challenge on Liam Lawrence. Jamie Ashdown restarts play with the free kick.
45:01 The referee blows his whistle to start the second half.
45:00+2:06 The whistle is blown to end the first half.
45:00+1:21 Unfair challenge on Souleymane Bamba by Dave Kitson results in a free kick. Richie Wellens takes the free kick.
44:42 Outswinging corner taken right-footed by Paul Gallagher.
43:59 Corner from the right by-line taken by Paul Gallagher, David Nugent makes a clearance.
38:41 Free kick awarded for an unfair challenge on Ben Mee by Jonathan Hogg. Paul Gallagher crosses the ball in from the free kick,
David Nugent makes a clearance.
38:41 Booking The referee shows Jonathan Hogg a yellow card.
38:01 The referee gives a free kick against Hermann Hreidarsson for handball. Free kick taken by Ricardo Pereira.
36:35 The ball is sent over by Paul Gallagher, Headed from the edge of the area by Andy King goes wide of the left-hand upright.
35:41 Booking The referee books David Nugent for dissent.
33:05 The assistant referee signals for offside against Liam Lawrence. Free kick taken by Jeffrey Bruma.
32:00 Ayegbeni Yakubu fouled by Hayden Mullins, the ref awards a free kick. Shot comes in from Paul Gallagher from the free kick,
Jamie Ashdown makes a save.
29:28 Effort on goal by Ayegbeni Yakubu from just inside the penalty area goes over the target.
28:44 Jonathan Hogg concedes a free kick for a foul on Paul Gallagher. Ben Mee takes the free kick.
27:38 Free kick awarded for a foul by Ben Mee on Dave Kitson. Liam Lawrence restarts play with the free kick.
25:48 Andy King fouled by Greg Halford, the ref awards a free kick. Free kick crossed right-footed by Paul Gallagher, clearance
made by Hayden Mullins.
25:07 Dave Kitson concedes a free kick for a foul on Yuki Abe. Jeffrey Bruma restarts play with the free kick.
24:33 Paul Gallagher produces a right-footed shot from outside the penalty area and misses left.
21:53 Inswinging corner taken by Liam Lawrence from the left by-line, Andy King makes a clearance.
19:49 Inswinging corner taken from the left by-line by Liam Lawrence.
17:10 Jeffrey Bruma concedes a free kick for a foul on Dave Kitson. Liam Lawrence produces a shot on goal direct from the free kick.
15:56 Corner taken by Paul Gallagher, Darius Vassell takes a shot. Save made by Jamie Ashdown.
15:11 Outswinging corner taken from the right by-line by David Cotterill, save made by Ricardo Pereira.
14:26 Corner taken right-footed by Paul Gallagher to the near post, clearance made by David Nugent.
12:58 GOAL - David Nugent:Leicester 0 - 1 Portsmouth A goal is scored by David Nugent from inside the box low into the middle of the goal. Leicester 0-1 Portsmouth.
10:05 Free kick awarded for a foul by Ritchie De Laet on Souleymane Bamba. Free kick taken by Ricardo Pereira.
7:48 A cross is delivered by Paul Gallagher, Headed effort from deep inside the penalty area by Ayegbeni Yakubu misses to the left
of the goal.
7:28 Short corner taken by Paul Gallagher from the left by-line.
5:51 Unfair challenge on Ayegbeni Yakubu by Greg Halford results in a free kick. Paul Gallagher takes the direct free kick.
0:56 Free kick awarded for an unfair challenge on Liam Lawrence by Jeffrey Bruma. Free kick taken by Liam Lawrence.
0:00 The match has kicked off.
Live text and data provided by The Press Association.
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