Ighalo, who signed a new five-year contract on Friday, converted Deeney’s cushioned header shortly before the hour mark to score Watford’s first goal since the opening day of the season.
The Hornets had failed to muster a single shot in their previous two games. And while they dominated a below-par Swansea, unbeaten in their opening four games, theuy had to wait until the 41st minute before calling Swansea goalkeeper Lukas Fabianski into action. Deeney, who played in a deeper role to limit the threat of Jonjo Shelvey, revealed he was worried his side would draw another blank.
Gomes, Nyom, Prödl, Cathcart, Anya, Capoue, Behrami, Abdi (Watson 66), Deeney (Diamanti 84), Jurado, Ighalo (Berghuis 71)
Fabianski, Naughton, Fernandez, Williams, Taylor, Cork (Ki Sung-yueng 66), Shelvey, Ayew, Sigurdsson (Éder 71), Routledge (Montero 60), Gomis