Neither Watford or Norwich City were able to find the breakthrough in goalless first period at Vicarage Road.
The visitors were awarded a free kick in a promising position inside the first 10 minutes, but Steven Whittaker could only fire over the bar.
Odion Ighalo did well before the half-hour mark to supply strike partner Troy Deeney, but the Hornets captain fired wide from a tight angle.
Norwich could have had the lead when Heurelho Gomes punched into the path of Whittaker, but his long-range effort was off target.
The Canaries were claiming for a penalty when Cameron Jerome went down inside the area under a challenge from Joel Erkstrand, but the referee waved away their appeals.
