Leon Knight had a game he'll never forget as the striker scored Swansea City's winning goal, missed a first-half penalty and was sent off after the break.
Leyton Orient also had Justin Miller sent-off in the first-half as Swansea came away with three precious points.
Leyton Orient: Garner, Miller, Lockwood, Fortune, Saah, Tudor (Barnard 35), Simpson (Ibehre 83), Easton, Keith (Connor 67), Alexander, Steele. Subs not used: Morris, Corden. Sent Off: Miller (35).
Booked: Alexander, Steele, Easton.
Sent off: Miller.
Swansea City: Gueret, Tate, Williams (Akinfenwa 69), Austin, Iriekpen, Amankwaah, O'Leary, Pratley, MacDonald (Way 90), Fallon (Butler 90), Knight. Subs not used: Oakes, Watt.
Booked: Knight, Austin, Amankwaah, Gueret.
Sent off: Knight.
Goals: Knight 54.
Att: 4,162
Ref: A Hall (W Midlands).
Swans boss Kenny Jackett recalled Alan Tate after completing his three-match suspension, while 18-year-old Shaun MacDonald was also given a start after returning from injury with Leon Britton ruled out with a knock.
Tom Williams was recalled to the side, while Rory Fallon and Knight started up front with Lee Trundle our with a hamstring injury.
Darren Way also made a welcome return to the subs bench after a long lay off with a shin injury.
The Swans were first to threaten when Kevin Amankwaah's eighth minute shot flew inches the wrong side of Glyn Garner's far post.
The Swans kept the upper hand in a first half of few chances as Darren Pratley burst clear in the 33rd minute.
Justin Miller tried to prevent Pratley having a shot, but only succeeded in upending the Swans skipper.
Referee Andy Hall had no hesitation in pointing to the spot and showing Miller the red card.
Knight stepped up to take the penalty, but former Llanelli 'keeper Garner saved the striker's shot for his sixth penalty save in the last year.
Six minutes later and Knight received his first yellow card when the referee claimed he dived inside the area.
But the smile was back on Knight's face in the 54th minute when a mix-up between Clayton Fortune and Garner allowed the diminutive striker to nip in and head into the empty net.
Orient could have had a penalty themselves on the hour when Craig Easton was pulled back by the already-booked Kevin Austin, but the referee deemed the foul to be committed outside the box and Austin got away unpunished.
Knight wasn't so lucky 25 minutes from time after collecting a second yellow for a late tackle on Donny Barnard.
With both sides down to 10 men, Shaun MacDonald could have decided the matter a minute later only to fire a good chance over the bar.
It could have proved crucial as the O's nearly snatched the equaliser 10 minutes from time when Lockwood's corner was headed on by Connor. Barnard was perfectly placed to meet it, but his shot was blocked on the line by Austin.
Fallon could have killed the game off for Swansea soon after as he raced clear on goal, but he blazed over.
In the end it was a fantastic three points for the Swans - and a game Knight won't forget in a hurry.
