Wallabies hooker Tatafu Polota-Nau has been playing through as good as a broken arm, coach Michael Cheika says, and wont play another Test until its fully healed.Polota-Nau was the surprise high-profile casualty from Cheikas 30-man squad on Thursday for the Rugby Championship clashes against South Africa and Argentina.The 31-year-old fractured his right arm for the second time while playing for the NSW Waratahs in March.Despite playing through significant pain in the June Test window and the early part of the Rugby Championship, hes still not 100 per cent, and after discussing the situation with Polota-Nau, Cheika said the best course of action was for him to stop.Hes as good as playing with a broken arm. His arm hasnt mended properly, Cheika told reporters on Thursday.Hes got the plate in there and hes been really pushing hard and its a real credit to him because its been tough for him.But thats enough now.Polota-Naus a player that we want. What hes adding in games has been really vital for us and hes a player we want in top condition going forward.His decision to either have a rest or operate or whatever it might be, well make in the next couple of weeks and decide then what happens for him for the rest of the season.Polota-Naus understudy at the Waratahs, Tolu Latu, has joined the squad as his replacement and is one of two uncapped players, along with winger Sefa Naivalu, in line to become Australias 10th Test debutant this year.Cheika said he would do everything he could to ensure Polota-Nau returned to Super Rugby as soon as possible, amid reports hes agreed to a big-money deal with English Premiership club Bristol.Veteran winger Drew Mitchell, lock Will Skelton and back-rower Ben McCalman have been left out of the side due to a lack of recent match fitness.Mitchell will return to his French club Toulon, leaving Will Genia as the last remaining European-based Wallaby.The Fiji-born Naivalu finally became eligible to represent Australia on Monday and Cheika said he was excited to see what he could offer the team.Weve been going through a bit of a changeover in a few positions and the idea is that were going to build more depth, he said.Young prop Allan Alaalatoa is also in the mix after overcoming the medial ligament strain he suffered in Brisbane, although Cheika admitted it was touch and go whether he would be right to take on the Springboks in Pretoria on October 1.The Wallabies face Argentina at Londons Twickenham Stadium a week later.Wallabies: Allan Alaalatoa, Rory Arnold, Adam Coleman, Quade Cooper, Kane Douglas, Scott Fardy, Israel Folau, Bernard Foley, Nick Frisby, Will Genia, James Hanson, Dane Haylett-Petty, Reece Hodge, Michael Hooper, Sekope Kepu, Samu Kerevi, Tevita Kuridrani, Tolu Latu, Sean McMahon, Stephen Moore (c), Luke Morahan, Dean Mumm, Sefania Naivalu, Nick Phipps, Tom Robertson, Rob Simmons, Scott Sio, James Slipper, Henry Speight, Lopeti Timani. 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SAN DIEGO -- Robbie Ray had life on his fastball and feel for his slider in the bullpen before the game and figured he was in for a fun one.I knew it was going to be a good day, Ray said.Ray struck out a career-high 13 and gave up just one hit in seven innings, pitching the Arizona Diamondbacks past the San Diego Padres 2-1 on Saturday night.He was letting it fly with better location, Arizona manager Chip Hale said.There were no hits in the game until the fifth. Arizona finished with four, and the Padres got three.Ray (7-11) overpowered the Padres until the fifth, when Patrick Kivlehan, called up from Triple-A El Paso before the game, launched a 451-foot home run for his first major league hit.One pitch with two strikes he left over the plate, Hale said. Other than that he was outstanding.Arizona used four relievers to close it out. Daniel Hudson induced three infield popups to escape a bases-loaded, no-out jam in the eighth and Enrique Burgos earned his first save of the season.Im just getting more confident in my stuff, said Ray, who has allowed three runs (two earned) and 12 hits in his last three starts. Im just trying to get better every time out.Ray threw 22 strikes in his first 26 pitches.It was all about fastball command, he said. It was mostly fastballs I was throwing and it was just the movement on both sides of the plate.As the game progressed, the Padres were set up to flail away at Rays deceptive slider.That kept them off my fastball, he said.The Diamondbacks scored two unearned runs, helped by a pair of throwing errors by pitcher Clayton Richard (0-3).Richard gave up two hits in six innings. He struck out five and walked three but was done in by the errant throws. Hes had a history of trouble throwing to bases.Unfortunaately not fielding my position cost us, Richard said.ddddddddddddThat definitely stings because you play to win, and to have a couple fielding plays cost you the game, thats really tough.The Padres got little help in trying to touch Ray.It was 1-all in the sixth when Phil Gosselin singled and Paul Goldschmidt walked. Rickie Weeks Jr. hit a grounder to Richard, who wheeled and threw the ball into center field, allowing a run to score.In the Arizona fifth, Welington Castillo singled and Mitch Haniger hit a comebacker that Richard also threw into center. Brandon Drury then grounded into a double play, with Castillo scoring for a 1-0 lead.Kivlehan had two of the Padres hits.Regardless of the outcome of the game, thats a pretty sweet moment, Green said of Kivlehan going deep. Guys dreamt about doing that his whole life and he hits one 450 in the big leagues. Thats really special for him.TRAINERS ROOMDiamondbacks: SS Nick Ahmed will undergo season-ending hip surgery next week. He should be fit for spring training.Padres: RHP Tyson Ross (shoulder) threw a simulated game. Ross, who hasnt pitched since opening day, could be sent out on a rehab assignment next week.UP NEXTDiamondbacks: RHP Braden Shipley (2-2, 4.85) is facing the Padres for the first time in his sixth career start. Shipley had a rocky outing his last time out on Tuesday, surrendering seven runs (six earned) over five innings to the New York Mets.Padres: RHP Luis Perdomo (5-7, 6.68) tries to snap a three-game losing skid, although he pitched well against the Tampa Bay Rays on Monday. Two of his wins have come against Arizona, including one in relief. ' ' '