Sean McMahon has warned his detractors and positional rivals that he wont be giving up the Wallabies No.8 jersey without a fight.Coach Michael Cheika has endorsed the abrasive McMahon as the clear frontrunner to replace David Pocock, who will take a break from rugby in 2017, at the back of the Australian scrum.With Pocock out injured again, he gets another chance to prove his worth in Saturdays Rugby Championship clash against South Africa in Pretoria.The 22-year-old has heard all the talk before - that hes too short to play at No.6, too small to be an effective No.8, and unlikely to unseat Michael Hooper anytime soon at No.7.But that wont deter McMahon, who has vowed to make the position suit him, even if he doesnt traditionally suit the position.Any opportunity to throw on the gold is an opportunity and if eights going to be that opportunity, Im going to be taking it with both hands, McMahon said.Theres players like Lopeti Timani and that who could easily lock that role down or take it from me but I can tell you its not going to come easily - theyre going to have to work for it.Learning from a player like Pocock, who is also a seven whos worked his way into eight, I think hes proved that if youre capable (you can) go into that eight role and really make it your own.I might not be the tallest player out there, but Im going to (counter) that with speed.Ill just continue to bring that where I havent got the height.McMahon has had his tattooed left arm covered up during training this week after some recent new ink on his elbow - a third eye, which he admits doesnt hold any special meaning.Theres a few things on here that dont really mean much, were just filling her up at the moment, he said.But further up his arm, theres something that does hold significance - a quote he had etched as an 18-year-old that sums up his approach to rugby, and the reason why Cheika is such an unabashed fan of his.Life is what we make of it. 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Penrith coach Anthony Griffin was in no mood to celebrate after the Panthers cemented a NRL finals berth, with key forward Reagan Campbell-Gillard taken to hospital with a suspected back fracture.He was also unhappy about Penriths dumb first-half performance on Saturday night, which allowed Gold Coast back into the contest.Matt Moylans field goal two minutes from fulltime sealed the 15-14 victory, but Griffins thoughts were centred on the Panthers allowing the Titans to recover from 14-0 at halftime.The game at Cbus Super Stadium seemed to be heading into golden point after Tyrone Roberts kicked a penalty goal four minutes from time following a high tackle from Penriths Chris Grevsmuhl on Ryan James.It was terrible the way we let them back into the game, Griffin said.It was a very dumb half of football.Its nice to know that were definitely there (in top eight), but its going to have to be a lot better than that if were going to do something with the (finals) spot.One man Griffin praised was Tyrone Peachey, who made the crucial line break, bringing the ball to within 20m of the tryline and allowing Panthers skipper Moylan to coolly split the uprights to snatch the game.But the Panthers have a nervous wait for news on Campbell-Gillard, whose season is likely over after being injured in a tackle.But Penrith general manager Phil Gould later tweeted although the key forward was in pain, there was no suggestion of nerve or spinal damage.Still to have full X-ray however Doctorr confident no long term issues.dddddddddddd Painful now but expect full recovery in time, he posted.The pre-game focus was on Jarryd Haynes first match at fullback for two years, but he was outshone by his opposite number, Moylan, who scored the Panthers first try.In the eighth minute, Moylan received the ball and cut inside off his right foot, racing past Titans defenders and touching down.The lead was doubled in the 17th minute when, after Bryce Cartwright broke the line and was tackled by Hayne 10m out, the Panthers quickly spread it wide and Waqa Blake dived over.Hayne had a chance to score the first try of his NRL return just before the break when he burst towards the line after an offload from Leivahu Pulu, but the Panthers No.1 stopped him.Just after halftime, the Titans were back in it when Pulu was fed by Greg Bird 5m out and he carried three defenders over the line for his first NRL try.Then Bird set up a dramatic finish when he stretched out over the line, in spite of the efforts of Moylan and Peter Wallace, to make it a two-point game.The Titans need to beat North Queensland in Townsville next week or hope other results go their way.Coach Neil Henry will keep an eye on Sundays Warriors-Wests Tigers clash, but backs his team to get a result next Saturday against the Cowboys.Its not over. 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