Swindon took the lead on 10 mins after a 30 yard free kick from Johnnie Jackson, on loan from Spurs flew in.
Southend scored 10 minutes later, and Swindon kept on missing chances as usual with Invincibile missing when it would have been easier to have scored. An Andy Gurney free kick also hit the post.
Swindon's lead was restored on 24 minutes with a good goal from Jimmy Davis on loan from Manchester United, Heywood then scored again just before half time.
As the second half got under way Invincibile who had missed many chances in the first half got himself on the score sheet. The game then died down a bit, although Southend's Clark was sent off mid way through the second half. Swindon took off keeper Bart Griemink mid way through the second half as well to give reserve keeper Craig Farr a chance at first team action.
The game looked like finishing 4-1, with Sabin also missing a good chance late on, but a 35 yard shot from Miglioranzi beat everyone to end up in the back of the net with one minute of normal time remaining. Sam Parkin then added himself to the score sheet deep into injury time to make sure of Swindon's place in Round 2, and to add himself to the score sheet.
Overall a very good Swindon display, with a lot of passing. Why can't we play like this every week?
Swindon's next game is at home to Mansfield this Saturday.