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Her final bowl on each of the last two ends saved the game when North East Valley looked like snatching a come-from-behind win.
The Taieri pair of Jean Young and Barclay beat Bronwyn Stevens and Rachel McDowall (North East Valley) 19-15 to give Taieri a win in the five-game round-robin competition.
Taieri topped the Bowls Dunedin event with 34 points and was followed by North East Valley 30, Green Island 24, Fairfield 19, St Clair 18 and Outram 9.
North East Valley led Taieri by two points before the final round and was assured of three more points when international Sarah Scott remained unbeaten with five wins in the singles. Taieri singles player Beth Brown won three of her five games.
Taieri needed to win two of the last three games to travel to Auckland for the national finals in March.
The fours team of Jenny Dhyrberg, Judy Robertson, Barbara Archer and Janet Swallow beat Kay Hammond's North East Valley four 18-6 for the team's fifth win.
The pair was the last game to finish on the Taieri green. The home team looked to have it in the bag when it led 16-8 after 12 of the 18 ends.
However, North East Valley recovered to close the gap to two shots, 17-15, with just two ends left.
On the penultimate end, North East Valley held the shot before Barclay moved the jack sideways with her last bowl to give Taieri a three-point cushion before the final end.
On the final end, Stevens' weighted shot moved the jack backwards to give North East Valley three shots.
It stayed this way before Barclay played her last bowls.
Barclay, a motel manager, rolled her first bowl into the ditch and was short with her second. But she thrives on pressure after playing bowls for 22 years and nestled her final bowl alongside the jack.
``It was a ripper,'' Barclay explained as she rushed up the green to hug Young in the middle of the green,
Kaikorai won the final of the men's division 1 competition when it beat North East Valley 6-3 on its home green.
The outcome again depended on the pairs after World Bowls champion Mike Kernaghan (North East Valley) beat Craig McCaw 21-17 and the Kaikorai four of Joe Gordon, Callum Horwell, Jonty Horwell and Regan Larkin beat Terry Scott's North East Valley four 17-11.
The Kaikorai pair of Geoff Wilson and Nigel Birkbeck started slowly and trailed former internationals Jim Scott and Shaun Scott 0-9 after four ends.
Kaikorai took the lead for the first time on the 13th end 14-13 and led by two shots before the final two ends and won the game 20-13 when Shaun Scott missed with his final drive.
In the semifinals, Kaikorai beat St Clair 9-0 and North East Valley beat Taieri by the same score.
Kernaghan won his five singles games at the weekend and the Kaikorai pairs and fours were also unbeaten.
Forbury Park beat Taieri 6-3 in the women's division 2 final.