John Watson was born in Belfast and educated at Rockport School, Northern Ireland. Watson's Formula One career began in 1972, driving a customer March-Cosworth 721 for Goldie Hexagon Racing in a non-Championship event: the World Championship Victory Race at Brands Hatch. Watson's first World Championship events came in the 1973 season, in which he raced in the British Grand Prix in a customer Brabham-Ford BT37, and the US Grand Prix, where he drove the third works Brabham BT42. Neither was particularly successful, as in the British race he ran out of fuel on the 36th lap and his engine failed after only seven laps in the United States event.