Bob Bradley's first home game as Swansea City manager ended in a goalless draw as the hosts were held by Watford.
After the two sides played out an insipid first half, Hornets keeper Heurelho Gomes made an excellent sprawling save to deny Mike van der Hoorn from close range.
Swansea poured forward in desperate search of a winner but Watford had a penalty appeal rejected when Valon Behrami fell under a challenge from Kyle Naughton.
Gylfi Sigurdsson then hit the post for the Swans, who are winless in the Premier League since the opening day of the season and stay second from bottom in the table.