In his rookie season, Alworth had just 10 receptions in 4 games (though three were for touchdowns). His second year was a different story, as he set franchise records in receptions (61), yards (1,205), and touchdowns (11), earning the UPI's AFL Most Valuable Player award. He had 4 receptions for 77 yards, including a 48-yard touchdown, in San Diego's AFL championship win over the Boston Patriots. He was selected as an AFL Western Division All-Star for the first of seven consecutive seasons, as well as an AFL All-League flanker for the first of six seasons, selected by his peers from 1963 to 1966, and by newspaper wire services from 1967 to 1968.