Smalldon finished in second place in the 1950
PGA Assistants' Championship, 7 shots behind the winner,
Harry Weetman. Weetman finished with a
hole-in-one at the final hole. He also finished tied for second in the 1950 Welsh Professional Championship, 6 shots behind
Gwyn James. Smalldon won his first Welsh Professional Championship in 1953 at Tenby, beating Finlay Morrison by 1 stroke. He tied with
Harry Gould in the 1954 Welsh Professional Championship at Holyhead but lost by 5 strokes in the 36-hole playoff. Smalldon and Harry Gould represented Wales in the
Canada Cup in Washington, D.C. in June 1955. In the
1955 Open Championship, on the
Old Course at St Andrews, Smalldon started with 70, a shot behind the leaders. After a second round 69 he was in a three-way tie for the lead. A third-round 78 dropped him down the leaderboard and he eventually finished tied for 17th place after a final 73. In March 1956 Smalldon and his partner
Graham Knipe won the
Sunningdale Foursomes. Smalldon won the Welsh Professional Championship for the second time. He again represented Wales in the Canada Cup, this time played at Wentworth. Smalldon and Rees were in third place but Smalldon had a poor last day and the pair finished in sixth place. In the
1956 Open Championship Smalldon only just qualified, scoring 152 for the two rounds. He then scored 68 in the first round to lead the field on his own. A second round of 79 dropped him down to 7th and further rounds of 78 and 78 left him tied for 28th place. He won the
Tooting Bec Cup for his first round 68. After two unsuccessful seasons, Smalldon showed a return to form in 1959. In June he won his third Welsh Professional Championship, beating Harry Gould by 3 strokes at Newport. The following day he led the Welsh section qualifying for the
British PGA Matchplay Championship, 6 shots ahead of the field. In late August he and his partner,
Dai Rees, won the
Sherwood Forest Foursomes Tournament. ==Death==