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Italy began their World Cup Pool B campaign in changing weather conditions.
The Namibian part-timers took an early lead through Damian Stevens before the Azzurri drew level.
Italy subsequently took control with tries.
While Chad Plato along with JC Greyling scored consolations Matteo Minozzi, edoardo Padovani, Carlo Canna, Jake Polledri felt after the break.
Italy originally fought in the rain and had to wait till the 25th minute to take the direct, but since the sun appeared at the second halfof the Six Nations side turned on the design as they overpowered their competitors, who in 23 are the lowest ranked side in the tournament.
Italy captain Sergio Parisse, 36, became just the third person to play five World Cups, fitting the levels of compatriot Mauro Bergamasco and Samoa’s Brian Lima, and his 141st international cap also attracted him level with former Ireland and British Lions captain Brian O’Driscoll in second position on the one time record.
“The main thing was to win and accept the five points,” Parisse stated.
“Big congratulations to Namibia also because they gave up. They kept playing to the end.”
The only negative for the Azzurri was when Tiziano Pasquiale was stretchered off before the break.
Play was paused for what seemed to be a neck injury while the prop received medical attention.
Italy are next in action against Canada on Thursday, 26 September (08:45 BST), although Namibia confront neighbors South Africa on Saturday, 28 September (10:45).
Defending champions New Zealand, who beat South Africa on Saturday, will be another group in the category.
Italy: Hayward Benvenuti, Morisi, Padovani; Allan, Tebaldi; Quaglio, Bigi, Pasquali, Zanni, Ruzza Mbanda, Parisse.
Replacements: Fabiani, Ferrari, Riccioni Polledri Canna, Minozzi.
Namibia: Greyling, Tromp, Plato De la Harpe; Loubser, Stevens; Rademeyer, Van Jaarsveld, Coetzee, Van Lill Kitshoff Venter.
Replacements: Van der Westhuizen, De Klerk, Theron, Retief, Katjijeko, Walters, Jantjies, Kisting.
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