Wedlock won 31-18 to clinch his third Zone title of the season after combining with Irish star Kelly and Brendan Aquilina to win the Triples, while Wedlock, Jamie Turner, Aquilina and Aaron Teys won the Zone Fours back in early February.

It is the first time a Zone 16 club has won all four Open Zone Championships - Singles, Pairs, Triples and Fours - in the one calendar year since Illawarra/Zone records began in the mid-1950s.

Warilla previously came close to a grand slam in 2000 after winning the Zone Singles, Pairs and Triples, but were denied the sweep with Wollongong RSL taking out the Fours.

Warilla have been so dominant in the Open Championships this season that they not only swept the four titles, but featured in every Zone final except the Triples, where Oak Flats' Luke Cocksedge, Steve Sprod and Grant Burbidge reaching the decider.

Warilla's John Thompson, Peter Read, Rob Tynan, Dallas Delatorre also won the Senior Fours in 2020, leaving the Gorillas with five representatives at next year's State Championships.

It's been a frustrating year for Jackaroos stars like Corey Wedlock who've had their national events cancelled due to COVID-19. But the 24-year-old was rapt to claim his first Zone 16 Singles and three of the four Open Zone titles for 2020.

''It is one of the strongest zones around so to win the Singles is special,'' Wedlock said.

Kelly added that helping Warilla achieve the grand slam of Zone Open titles was a source of pride.

''It's a great achievement for the club,'' Kelly said.

The Open Singles included more than 70 bowlers with the early rounds delayed until mid-August and then again postponed due to COVID restrictions at the quarter-final stage.

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The quarter-finals featured four Warilla internationals, plus a fifth international, Corrimal's Pete Bonsor; a Spanish rep and 2018 Zone Singles runner-up.

Talented youngsters Corey Thompson (Albion Park) and Jayden Gebbie (Figtree Sports) also reached the last eight along with bolter Daniel Nanasi from Fairy Meadow.

In a dream quarter-final match-up, Irish international Kelly beat Warilla clubmate and Jackaroos star Aaron Teys 31-19, while Wedlock ended the run of Maltese international Brendan Aquilina 31-23. Wedlock then beat Pete Bonsor 31-22 in a 35-end semi-final. Wedlock led 17-13 on 19 ends before winning six of the next eight ends to claim a match-winning 24-15 lead.

In the other semi-final, Kelly was always in control in a 31-14 win over Thompson.

Wedlock will now take his place among Zone Singles champions from across NSW at the State Championships in early 2021.

Greg Wray won six matches over four playing days to clinch the Zone 16 President's Reserve Singles title at Windang BC.

The Figtree Sports member is relatively new to bowls after being a top local cricketer and defeated Corrimal's Dave Gould 31-18 in the Grade 5-7 Singles final.

While representing the Orb, Wray was a finalist in the Zone 16 Rookies Pairs and Singles in 2018 and again made the 2019 Singles decider before breaking through to win the Zone Rookies Pairs last year. The 2020 Zone Reserve Singles featured more than 120 bowlers with Wray knocking out defending champion Chris Rae (Bomaderry) 31-29 at the quarter-final stage and beating Woonona's Luke Tolhurst 31-22 in the semis.

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Meanwhile, 2018 Senior Singles champion Brian Suckley and Wiseman Park clubmate Robbie Warren are into the Zone Over 60s Singles semi-finals. Warren edged out Thirroul's Glen Aitken 31-30 in a quarter-final thriller to set up a clash against Thirroul's Daryl Webster on Saturday morning at Figtree Sports.

In the other semi, Suckley will take on Bomaderry's Eric Lane who had a tense 31-30 quarter-final win over Figtree's Harry Johnston.

The final is on Saturday afternoon at Figtree, with the winner to represent the Zone at the State Championships.

Rhonda Munro and Pat Hennessy completed an impressive championship by claiming the Kiama Ladies Pairs crown.

The duo overcame Cathy Dawson and Bronwyn Campbell (skip) 21-19 in a thrilling decider to an event featuring ten teams.

Both finalists started well with skip Hennessy picking up a rare six on the fifth end to lead 10-2.

On the 16th end Dawson and Campbell picked up a six to tie the match at 16-16 with two ends to play.

In a tense finish Munro and Hennessy scored a four on the final end to claim a comeback 21-19 triumph.

In the semis, Munro-Hennessy beat Melanie Walker and Gaye Reynolds 17-15, while Dawson-Campbell defeated Carol Justice and Jenny Kelvin 13-6.

The final will be remembered as one of the best games of the ladies season with both teams poised to take the Pairs crown for 2020.