Sean Baldock (Hastings), who lost his Sussex Championship record to Belgrave clubmate Tim Bayley when injury ruled him out, had a blinding run in the European Clubs final at Madrid.
Running his first straight 400m since the Olympics, he clocked a brilliant 46.35sec behind Russian Dimitri Golovastov.
That was a full second faster than Bayley's effort in the county event.
Bayley and Baldock were both members of the third-placed Belgrave team in the 4x 400m relay.
Another Sussex athlete in good form with the Belgrave club in Madrid was county hammer champion Mick Jones, from Crawley.
Jones was again over the 73m mark, the only British thrower to beat 70m so far this season. Jones finished in fifth place with a fine effort of 73.43m.
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