Swansea City's poor run continued as 10-man Gillingham pulled off a Liberty Stadium shocker with their first away win of the League One campaign.
Despite having Neil Harris sent of in the 68th minute, they held on to their two-goal lead as Andy Robinson pulled one back late on from the penalty spot.
Swansea City: Gueret, Ricketts, Britton (MacDonald 65), Monk, Iriekpen, Martinez, McLeod, Robinson, Way (Forbes 45), Knight, Fallon.
Subs Not Used: Murphy, Akinfenwa, Watt.
Booked: McLeod.
Gillingham: Brown, Clohessy, Cox, Johnson, Black (Grant 79), Jackman, Spiller, Flynn, Crofts, Byfield, Harris (Pouton 71).
Subs Not Used: Crichton, Hope, Rose.
Sent Off: Flynn (69).
Booked: Cox, Flynn, Spiller, Black, Byfield, Brown, Pouton.
Att: 14,357.
Ref: M Fletcher (Worcestershire).
Swansea manager Kenny Jackett was forced to reshuffle his side again following the disappointing 1-0 defeat at Bristol City on Saturday.
With Lee Trundle ruled out with a tight hamstring, his place was taken up front by Leon Knight.
He partnered fellow new signing Rory Fallon in attack, with the New Zealander making his home debut following his move from Swindon last week.
Sam Ricketts returned following flu to take up the left-back spot, but with Alan Tate still out with a dead leg, midfielder Leon Britton had to move to the right-back role.
Garry Monk and Izzy Iriekpen remained in the heart of the defence, while Kevin McLeod came back from an ankle injury to start wide on the left of midfield. Andy Robinson moved to the right with skipper Roberto Martinez and new signing Darren Way in the middle.
With the Swans slipping to fourth on the back of just one win in nine, Jackett was looking for a maximum haul from the game with another home match against Bournemouth due three days later.
They faced a Gillingham side making their second trip to the Liberty Stadium after the scheduled game on December 28 was called off due to a frozen pitch.
The Gills arrived in 18th place and looking for their first away win of the season.
Swansea started brightly as Fallon met a Knight cross in the 10th minute only to see his header fly inches wide.
Knight was in the action again minutes later as he fed Robinson, but his shot flew across the face of goal and wide.
With Swansea enjoying most of the possession, despite looking slightly anxious, they were rocked back on their heels in the 18th minute when Gillingham went into a shock lead.
Striker Darren Byfield turned past Iriekpen and Monk on the edge of the area and unleashed a fierce dipping shot which gave Willy Gueret no chance as it dipped under the bar.
Swansea failed to offer anything in response in a poor quality half as Robinson looked the only player capable of unlocking the visiting defence, despite some promising runs from the overlapping Britton.
Half-time: Swansea City 0 Gillingham 1
Adrian Forbes came off the bench for the start of the second half in place of the injured Way. Robinson moved back into the middle with Forbes starting on the right of midfield.
Knight won a free kick within the first two minutes of the restart after he was hacked down by Ian Cox on the edge of the area - a tackle that earned him a yellow card. But Robinson fired the free kick well over.
At least Swansea looked to have more urgency about them as Knight tried his luck from 25 yards which forced Jason Brown into a rare save.
The game deteriorated again until a deep cross from Forbes set up Fallon. The big striker got up well, but his far post header fell inches the wrong side of the opposite upright with 62 minutes gone.
Three minutes later and young Shaun MacDonald got his chance to impress as the 17-year-old replaced Britton who was suffering from a dead leg.
MacDonald had an immediate impact as he was brought crashing down by Mike Flynn. Having been booked minutes earlier for dissent, Gillingham found themselves down to 10 men as a second yellow followed with 68 minutes gone.
But just when things looked to be turning in Swansea's favour, they found themselves 2-0 down as Gillingham hit them on the counter-attack.
Tommy Black broke on the right in the 71st minute and when Forbes failed to clear his cross at the far post, Neil Harris was left with a simple chance to fire the ball home from close range.
Harris immediately left the field to be replaced by Alan Pouton, and Swansea had a mountain to climb.
They thought they had pulled one back in the 75th minute when Robinson played Knight in, but as he ran off to celebrate the ball hitting the back of the net, the offside flag ruined his moment of glory.
Knight made himself another good chance in the 82nd minute when he combined with Fallon, but the striker's powerful shot was beat out by Brown.
But the breakthrough finally came in the 83rd minute when Knight was brought down inside the six yard area by Leon Johnson.
The referee pointed to the spot and Andy Robinson fired home the penalty.
Fallon and Iriekpen came close as Swansea went in search of the equaliser, but it never arrived as Gillingham ran down the clock.
