| Full name: | Rex James Underdown |
| Born: | 4th September 1932, Buckenham, Norfolk, England |
| Died: | 27th July 2014, Timaru, South Canterbury, New Zealand |
| Batting: | Right-hand batter |
| Wicket-keeper | |
| Relations: | Brother: T Underdown |
| Teams: | South Canterbury (Hawke Cup: 1969/70); All teams |
| Lists of matches and more detailed statistics | |