Fabien Robert's second-half strike secured Swindon a hard-fought 1-0 win at Southend.
The Robins came closest to scoring in the first half with Nathan Byrne having a 20-yard shot parried to safety by Shrimpers goalkeeper Dan Bentley.
But after the break, the hosts wasted two golden chances to take the lead.
With 52 minutes on the clock, an unmarked Jack Payne fired wide of the left-hand post from 12 yards after Noel Hunt had headed David Worrall's left-wing cross into his path.
Moments later, Hunt was...