Wigan recorded the surprise result of the day beating Tottenham at White Hart Lane to win their second Premier League game on the spin.
The Latics followed up last weeks success against at home to West Ham with a morale boosting victory in North London that will serve as a huge reality check to Andre Villas-Boas.
Spurs have now lost their last two games at home and dropped out of the top four after Watson’s second half goal consigned them to defeat on a frustrating afternoon.
Robert Martinez’s men have endured a mixed record in North London registering a registering a 1-0 win in 2010 but suffering a 9-1 drubbing in 2009.
From the off Wigan looked self-assured and at ease against their opponents, who are chasing a return to the Champions League season, and Brad Friedel was by far the busier of both keepers.
Shaun Maloney and Arouna Kone tested the American stopper early on before Watson passed up a great opportunity to break the deadlock, firing over the bar from the edge of the penalty area.
Spurs finally stepped into gear but Jan Vertonghen’s dipping volley represented their best chance of the first half as they managed to subdue the visitors until the break.
But 10 minutes into the second half Roberto Martinez’s men deservedly took the lead as Watson hammered the ball home from close range after Friedel had brilliantly clawed Maloney’s whipped corner from underneath the crossbar.
Emmanuel Adebayor was thrown on by Villas-Boas to replace Jermain Defoe t but failed to muster anything close to the equaliser a discontented home crowd craved.
Gareth Bale came close to restoring parity but Ali Al-Habsi was equal to his fierce strike but Maynor Figueroa smashed a long range effort just wide of Friedel’s post at the other end as Wigan held on to a monumental win.