* Watford beat Everton 1-0 on Silva's return to Vicarage Road
* Substitute Andre Gray scored the winning goal in the second half
* Watford's Etienne Capoue was denied by Jordan Pickford early on
* Gylfi Sigurdsson hit the bar on a frustrating day for Everton
* Watford are at Cardiff City on Feb. 22, four days before Everton visit the Welsh club
WATFORD 1 EVERTON 0
Feb 9 (Reuters) - Substitute Andre Gray scored a second-half winner as Watford beat Marco Silva's Everton 1-0 in the Premier League on Saturday to heap the pressure on their former manager.