It takes the Nigerian international just 10 minutes in his debut appearance to open his goal account for the Hornets
Emmanuel Dennis became the fourth Nigerian player to score on his Premier League debut after opening the scoring against Aston Villa on Saturday.
The 23-year-old, along with his compatriots Oghenekaro Etebo and William Troost-Ekong, made their debut in the English top flight at Vicarage Road, and he immediately made a statement in front of the goal.
Dennis led the hosts early with his strike in the 10th minute, and he later contributed to their second goal with an assist.
He enlisted the help of Ismaila Sarr, Senegal, to double their lead on Vicarage Road, just three minutes before half-time.
His goal puts him alongside John Utaka, Peter Odemwingie and Odion Ighalo as Nigerian players who scored on their first outing in the Premier League.