But they had to settle for a 3-3 draw with Italy in Rome having led 3-0.
Watson is enjoying himself on loan from Albion to Millwall and he caught the eye here.
Having gone close early on, he fired home the opener to round off a good move.
Watson’s second goal was a header late in the first half.
After the interval, he whipped in a corner with good pace, allowing Manchester United’s Ayden Heaven to head the third.
But Italy had already had their chances and they came back in the final quarter with three goals.
Watson was off the pitch during the home comeback, having been substituted.
This was England under-20s’ only game of the current international window.
Meanwhile James Beadle, the Albion goalkeeper on loan to Birmingham City, was in goal for England under-21s in their disappointing 1-1 draw away to Andorra in a Euros qualifier.