Sussex under-14s secured five-wicket wins against Hampshire and Kent.
The under-tens were defeated by Surrey despite a man-of-the-match innings of 45 by Michael Chapman. He shared partnerships with Stuart Flint (34 runs) and Luke Wells (23). Bradley Bridson and Matthew Machan shared a 66 stand.
They also overcame Buckinghamshire with Michael Chapman (27) and Matthew Machan (23) top-scoring.
Sussex under-11s defeated London by nine wickets, but lost to Buckinghamshire (five wickets) and Dorset (40 runs).
Sussex under-13s suffered a 193-run defeat against Middlesex.
The under-16s Bowl final in the Sussex Junior Festival is at Arundel Castle on Sunday (11am).
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