Clare Shillington's powerful 48 steered Ireland to a 20-run win over South Africa in Dublin as the Twenty20 international series was drawn 1-1.
Shillington and Gaby Lewis (26) shared a run-a-ball opening stand of 78 to help the hosts to a total of 115-6.
Kim Garth took 2-12 as Ireland dismissed the Proteas for just 95 with three balls to spare, to avenge Monday's four-wicket defeat.
The sides now meet in five one-day internationals, staring on Friday.
Shillington struck six fours and cleared the ropes once in her 41-ball innings at Claremont Road before being run out by a direct hit - one of three in the innings.
The dismissal saw the boundaries dry up as South Africa squeezed the Irish in the final stages, restricting them to what looked a slightly below-par total at the halfway stage.
However, Ireland responded magnificently with a disciplined bowling display backed up by a determined fielding effort.
Garth kept things tight while South Africa's top scorer Trisha Chetty (28) was one of four run-outs for the buoyant Irish.
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Federico Fazio: Tottenham Hotspur defender joins Roma on loan
Hosts: Rio de Janeiro Dates: 5-21 August Rio time: BST -4
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The Rio 2016 Olympic Games got under way on Wednesday with a women's football match played in front of a sparse Olympic Stadium crowd.
Sweden won 1-0 against South Africa in the opener, before host nation Brazil's match against China.
Plenty of empty seats could be seen in the 60,000 venue at kick-off, although more fans arrived before Brazil's game.
The football tournament has started two days before Friday's opening ceremony because of a packed schedule.
Sweden, who are ranked sixth in the world, earned a narrow win when Nilla Fischer bundled in a second-half goal after a goalkeeping mistake.
The United States are widely considered to be the favourites to win the competition - which has no age limits - after claiming gold in London 2012 and also winning last year's World Cup.
The men's competition, which is contested by Under-23 teams, starts on Thursday.
The IOC said it hopes the "innovative" move will draw in new audiences by focusing inclusions on youth-oriented sports.
"We want to take sport to the youth," said IOC president Thomas Bach.
"With the many options that young people have, we cannot expect any more that they will come automatically to us. We have to go to them."
Tokyo 2020 president Yoshiro Mori added: "The inclusion of the package of new sports will afford young athletes the chance of a lifetime to realise their dreams of competing in the Olympic Games - the world's greatest sporting stage - and inspire them to achieve their best, both in sport and in life."
The unanimous decision to confirm the five new sports was made two days before the opening ceremony of the 2016 Rio Games.
Baseball/Softball
It is a combined bid of men's baseball and women's softball as both sports are hugely popular in Japan. Softball is a modified form of baseball with seven innings instead of nine, as well as underarm bowling.
Karate
Having originated in Japan, karate has never been contested at the Olympics. Judo, its fellow home-grown martial art, first joined in 1964, when Tokyo last hosted the Olympics, and has been included from 1972 onwards. The key difference is that judo is a grappling sport derived from jujitsu while karate is a striking, combat martial art.
Skateboarding
Street and park skateboarding have been included ahead of other roller sports including roller hockey, speed skating and artistic skating. The sport claims to be the most popular among young people. Its inclusion has been questioned by some as skateboarding does not have a world championship event.
Surfing
The inclusion is seen as a milestone for the sport given its popularity among young people. The International Surfing Association president Fernando Aguerre said: "Surfing embodies a cool, playful lifestyle that would add a completely new element to the programme, helping the Games reach new fans."
Sport climbing
Last year, sport climbing was chosen by the IOC as a demonstration sport at the Youth Olympic Games in Nanjing, China. Unlike most Olympic sports, sport climbing competitions see athletes support - even help - their opponents in finishing the climb. It is seen as the "most innovative" of the new sports by the IOC. Sport climbing involves participants scaling permanent anchors, like bolts, fixed to the rock. According to the International Federation of Sport Climbing, more than 140 countries have climbing walls, with 35 million climbers around the world.