Joe Gatting scored 55 in just 39 balls as Sussex under-15s beat Hertfordshire by seven wickets.
Gatting now has an impressive average of 80 after scoring 240 runs in four innings.
Michael Norris (43) and Michael Thornely (23) also did well with an opening partnership of 62 as Sussex made 147-3.
Hertfordshire had earlier been restricted to 143-8, thanks to good bowling by Norris (3-16).
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