Rugby World Cup 2019: Japan stun Ireland, Argentina power past Tonga, Springboks win 'African Derby' - in pictures

See a selection of the best images from some of Saturday's Rugby World Cup matches

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  Tendai Mtawarira of South Africa is tackled during the Rugby World Cup 2019 Group B game between South Africa and Namibia at City of Toyota Stadium in Toyota, Aichi, Japan. Getty Images

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  South Africa's prop Vincent Koch (R) is tackled by Namibia's lock Johan Retief (down) during the Japan 2019 Rugby World Cup Pool B match between South Africa and Namibia at the City of Toyota Stadium in Toyota City. AFP

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  South Africa's flanker Francois Louw (R) scuffles with Namibia's players during the Japan 2019 Rugby World Cup Pool B match between South Africa and Namibia at the City of Toyota Stadium in Toyota City. AFP

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  Makazole Mapimpi of South Africa breaks away to go on and score his team's seventh try during the Rugby World Cup 2019 Group B game between South Africa and Namibia at City of Toyota Stadium in Toyota, Aichi, Japan. Getty Images

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  South Africa's Eben Etzebeth and Namibia's Tjiuee Uanivi contest a lineout during the 2019 Rugby World Cup match at the City of Toyota Stadium, Toyota City, Japan. PA Photo.

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  South Africa's Frans Steyn is tackled by Namibia's Muharua Katjijeko, right, and Johan Deysel during the Rugby World Cup Pool B game at the City of Toyota Stadium between South Africa and Namibia in Toyota City, Japan. AP Photo

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  South Africa's Siya Kolisi is tackled by Namibia's Wian Conradie during the Rugby World Cup Pool B game at the City of Toyota Stadium between South Africa and Namibia in Toyota City, Japan. AP Photo

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  Nicolas Sanchez (R) of Argentina in action against Leva Fifita (L) of Tonga during the Rugby World Cup match between Argentina and Tonga at Hanzono Stadium in Higashiosaka, Japan. EPA

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  Tonga's Siale Piutau in action, Argentina v Tonga - Hanazono Rugby Stadium, Osaka, Japan. REUTERS

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  Emiliano Boffelli (top) of Argentina and Latiume Fosita of Tonga jump as they struggle to catch the ball during the Rugby World Cup match between Argentina and Tonga at Hanzono Stadium in Higashiosaka, Japan. EPA

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  Matias Alemanno of Argentina (C) in action against Tonga players during the Rugby World Cup match between Argentina and Tonga at Hanzono Stadium in Higashiosaka, Japan. EPA

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  Argentina's prop Mayco Vivas tries to control the ball during the Japan 2019 Rugby World Cup Pool C match between Argentina and Tonga at the Hanazono Rugby Stadium in Higashiosaka. AFP

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  Argentina's Agustín Creevy is tackled during the Rugby World Cup Pool C game at Hanazono Rugby Stadium, between Tonga and Argentina in Osaka, Japan. AP Photo

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  Guido Petti (top) of Argentina wins a line out ball during the Rugby World Cup match between Argentina and Tonga at Hanzono Stadium in Higashiosaka, Japan. EPA

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  Argentina fans cheer during the match, Argentina v Tonga - Hanazono Rugby Stadium, Osaka, Japan. REUTERS

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  Juan Figallo of Argentina walks with his kid after the Rugby World Cup 2019 Group C game between Argentina and Tonga at Hanazono Rugby Stadium in Higashiosaka, Osaka, Japan. Getty Images

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  Matias Alemanno of Argentina takes selfie photographs with fans after the Rugby World Cup 2019 Group C game between Argentina and Tonga at Hanazono Rugby Stadium in Higashiosaka, Osaka, Japan. Getty Images

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  Sibusiso Nkosi of South Africa competes in the air for the ball against Lesley Klim of Namibia during the Rugby World Cup 2019 Group B game between South Africa and Namibia at City of Toyota Stadium in Toyota, Aichi, Japan. Getty Images

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  Makazole Mapimpi of South Africa evades a tackle from Chad Plato of Namibia to go on and score his team's seventh try during the Rugby World Cup 2019 Group B game between South Africa and Namibia at City of Toyota Stadium in Toyota, Aichi, Japan. Getty Images

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  South Africa fan holds a flag depicting South African rugby players - South Africa v Namibia - City of Toyota Stadium, Toyota, Japan. REUTERS

The Rugby World Cup exploded into life on Saturday as Japan produced one of the biggest upsets in the tournament's history on home turf, stunning the highly fancied Ireland 19-12.

The Brave Blossoms were magnificent against the Irish, who came into the tournament ranked the best side in the world, and were roared on by a passionate crowd of 47,000 in Shizuoka.

The result throws Pool A wide open, as Japan took a huge stride towards their first-ever quarter-final from a group that also includes Scotland.

In the earlier World Cup game, Argentina got their campaign back on track after an agonising opening loss against France, beating a spirited Tongan side 28-12 with the help of a hat-trick from hooker Julian Montoya.

And South Africa routed Namibia as expected, also bouncing back after their loss to defending champions New Zealand in their tournament opener to record a 57-3 victory.

Check out the photo gallery above of Saturday's matches involving Argentina and Tonga and South Africa and Naimbia.

To move on to the next image, click on the arrows, or if using a mobile device, simply swipe.