Teresa Mainstone (Horsham Blue Star) won the Sussex Combined Events Championship title at Crawley by more than 4,000 points.
The 20-year-old showed her potential by taking second place in the South of England Heptathlon Championship at Hendon with a personal best 3,935 points last month.
Mainstone, under-20s winner last year, improved on all but two events in the county competition.
In the opening event, the 100m hurdles, she was just outside her season's best with 17.3sec but established a 200-point buffer.
The Horsham athlete was only beaten in the 200m and 800m with Elaine Wells (Crawley) edging both, each in a season's best of 25.5sec and 2min.26.1sec respectively.
Mainstone had season's best in the shot (9.19m) and 800m (2min.37.1sec).
She eventually added more than 100 to her previous personal best and cracked the 4,000-point mark for the first time with 4,071.
The total takes her into the Sussex All Time top ten at No.7.
Wells achieved a personal best 3,381 to take the silver medal.
In the senior men's decathlon, Matthew Tribble (Eastbourne) emerged the winner. He dominated from the start with 11.4sec in the 100m, but his best effort came in the javelin of 53.17m, the best by any Sussex athlete this season.
In the veteran decathlon events, Jenny Denyer (Haywards Heath) lost her crown to Amanda Godfrey (Chichester), while Barry Morris (Eastbourne), runner-up behind club-mate Ian Turner last year, won a gold medal.
Club-mate Brian Slaughter completed a hat-trick of crowns when he retained his National Veterans Decathlon Championship title at Sheffield with 6,097 points.
Caroline Hoyte (Arena 80) set a course record of 28min.11sec in the Hove Promenade Five-mile Road Race organised by her club.
She chopped one minute off the record set last year by Lynn Williams, also Arena 80, despite a strong, chilly northwesterly breeze.
Julia Armstrong (Brighton and Hove) was second (30min. 43sec), while another veteran, Jane Boulton (Crowborough), was third (31min.16sec).
In the men's race, Darrell Smith regained the title he lost to Geoff Hill (Phoenix) last year (25min.34sec).
Tom Burke (Haywards Heath) was second (26min. 17sec) with Kurt Hoyte, Caroline's husband, third (26min. 50sec).
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