Will Saxby, who scored twice, Dan Williams and Dave Dixon, from a penalty corner, were also on target as Hampstead, who have narrowly missed promotion to the PizzaExpress National League for the past three years, looked sharp.
Maidenhead went one better, winning 6-0 at Tulse Hill, where their coach, Kartar Davatwal, struck twice and Harjeet Chana, recently signed from Lyons, opened his account for the club. Adrian Hurley, Nick George and the captain, Richard Cawthorpe, completed the scoring.
Lyons, relegated from the National League last season, weathered early trouble against visitors Old Walcountians. Huw Pennell gave the old boys the lead but Lyons responded with five goals, three of them from Inderjit Ubbey. Old Kingstonians, who were also relegated, were held to a 0-0 draw by Mid Sussex.
In the Hants-Surrey Regional League, George Moroney and Steve Baker hit five goals apiece as Old Whitgiftians trounced Oxshott 11-0.
The newly combined SunLife West of England and South Wales League got under way at the weekend with a 2-0 win for Swansea at home to Brean. The other Welsh club in the Premier Division, Whitchurch, lost 2-1 to Taunton Vale.
In the Women's East Super League, goals from Helen Anton, Emma Walton and Sarah Thorp gave St Albans a 3-0 victory at Sevenoaks. St Albans are top on goal difference, ahead of Saracens, who beat Cambridge City 1-0.