The Premier Leageu confirmed Long's record, tweeting: "7.69 seconds - the fastest goal in #PremierLeague history!"
Before many spectators even had a chance to get settled into their seats, Irish worldwide Long had charged down Craig Cathcart's clearance and chipped the ball over Ben Foster to open struggling Southampton's account.
"You know that we depend on the results, at different times, so making medium-long-term plans for me does not make sense".
Sadly for Southampton, they could not hold onto the lead, which lasted until the 90th minute, when Andre Gray slammed home the equaliser after a goalmouth scramble.
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And Long's goal helped Southampton to another vital point in their quest for safety.
Some homework which Long had done on the habits of Foster aided him in scoring the goal.
King found the net against Bradford in 2000 after just 9.82 seconds and held the record for the best part of two decades.
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Wisconsin resident Manuel Franco, 24, is the victor of the third-largest Powerball jackpot in United States history. I had pretty much felt lucky... it's a weird feeling, not natural at all, ' he said at the press conference.
The strains of Elton John´s ´Rocket Man´ had barely finished booming over the loudspeakers when Long gave Southampton lift-off.
A pass back from Watford off the kickoff went to their central defender, who tried to play a long ball up field but had his kick blocked by Long.
The Saints could have scored more with Nathan Redmond and Ryan Bertrand both hitting the woodwork.
Christian Kabasele felt he should have been awarded a penalty after a shove by Long in the area, but referee Mike Dean thought otherwise.
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Watford moved above Everton into seventh place to keep up their hopes of qualifying for the Europa League.