Australia head coach Michael Cheika has made two changes to his starting line-up for Saturdays Rugby Championship game against Argentina at Twickenham. Lopeti Timani replaces the injured Sean McMahon in the back-row, beating Bath-based Leroy Houston for the Wallabies No 8 shirt.Houston may yet earn a Test debut via the bench, which has yet to be finalised. Rory Arnold of the Bumbies will start for Australia in the second row The towering Brumbies lock Rory Arnold will start in the second row alongside Adam Coleman, at the expense of Rob Simmons, in the only other change to the starting line-up from last weekends 18-10 loss to South Africa. Watch NOW TV Watch Sky Sports for just £6.99. No contract. In opting for the relative inexperience of Timani (one Test) and Arnold (four Tests), Cheika said the Wallabies could have no fear in backing young stars.We cant be frightened to do that. No matter what game it is, whether its Argentina or anyone else, he said. Highlights of the Rugby Championship clash between South Africa and Australia from Pretoria With the versatile Dean Mumm - a line-out specialist - making his home starting at blindside flanker, Cheika believes the Wallabies need a hard-runner at the back of the scrum in the mould of veteran Wycliff Palu.I think with the profile of the other players we have, like the sixes who are more the jumping-type sixes, that ball-carrying, Wycliff Palu-style No 8 is something that we want to have as well, Cheika said. Win the Rugby Trip of a Lifetime Enter a free prize draw when you buy tickets for Argentina v Australia at Twickenham We want to be able to do both. Leroy [Timani] is quite an abrasive runner as well, so theres a great opportunity to [see] how hell go with the step up.Arnold has impressed off the bench for Australia and earns the start ahead of Simmons, who suffering a head knock against the Springboks but has passed all concussion protocols. Speaking about picking Arnold, Cheika said: Hes just been aggressive, his lineout jumping has really improved, his mobility, ball carrying and every time hes come onto the field from the bench hes made an impact as a finisher.I just think its a real opportunity for him.Australia: 15 Israel Folau; 14 Dane Haylett-Petty, 13 Samu Kerevi, 12 Bernard Foley, 11 Reece Hodge; 10 Quade Cooper, 9 Will Genia; 1 Scott Sio, 2 Stephen Moore (c), 3 Sekope Kepu; 4 Rory Arnold, 5 Adam Coleman; 6 Dean Mumm, 7 Michael Hooper, 8 Lopeti Timani.Replacements (one to be omitted): 16 James Hanson, 17 Tom Robertson, 18 Alan Alaalatoa, 19 Kane Douglas, 20 Scott Fardy, 21 Leroy Houston, 22 Nick Phipps, 23 Tevita Kuridrani, 24 Sefa Naivalu.You can watch Englands tour of Bangladesh, plus Premier League football and the Japan Grand Prix on Sky Sports. Upgrade now and enjoy three months at half price! 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Nowitzki scored 28 points, Harris had a season-high 14 for the second straight game and the Dallas Mavericks beat the Detroit Pistons 116-106 Sunday night.(SportsNetwork.com) - Mike Zimmer is approaching the waning days of what he hopes is the first of many years as the Minnesota Vikings head coach. Joe Philbin is likely in the death throes of his three-year stint in Miami. Such is life in the NFL where 6-8 is considered progress in one city and being a tick better at 7-7 is a disappointment in another. The Dolphins and their lame-duck head coach will try to halt a two-game losing streak on Sunday when they host a Vikings team excited about the development of rookie quarterback Teddy Bridgewater, a Miami native. Philbins ultimate fate was probably sealed last weekend when Miami faltered in the second half and was doused by AFC East-rival New England, 41-13, in Foxbrorough. Tom Brady threw a pair of touchdown passes during a 24-point third quarter, as the Patriots clinched their sixth straight division title. Ryan Tannehill completed 29-of-47 passes for 346 yards with a touchdown and two interceptions for Miami, which had beaten New England in the season opener 33-20 but saw its already slim playoff hopes dashed further with the second straight loss. The Dolphins outscored the Patriots 23-0 in the second half back in September but had the tables turned this time to the tune of 27-0 in the final 30 minutes of this one. We have to play 60 minutes of football, Philbin said. You cant make the mistakes that we made. Miami is technically still alive in the postseason race but must win its final two games -- against Minnesota and the New York Jets -- and receive plenty of help elsewhere to get in. I believe in the players, Philbin said. I have confidence in the players. We have an outstanding locker room. The Vikings, meanwhile, had 10-4 Detroit on the ropes last weekend but faltered thanks in large part to a blocked, fourth-quarter field goal. The Lions Matt Prater hit his late field goal to lift Detroit to a 16-14 victory over Minnesota in the NFC North matchup. Bridgewater went 31-for-41 for 315 yards with a touchdown and two interceptions for the Vikings, who had won their previous two coming into the game. Leading by one Minnesota went on an impressive long drive that covered 75 yards over 18 plays and ate up 11 minutes, but the team came away empty as Blair Walshs 26-yard field goal was blocked by Jason Jones. Detroit then countered with the march that won the game, culminating with Praters 33-yard field goal for a 16-14 lead with 3:38 to play. The Vikings had chances, getting the ball back near midfield thanks to a big return from Cordarrelle Patterson, but Patterson fell on a fourth down passing play to give the ball back to Detroit. Minnesota forced a punt and got the ball back with 45 seconds, but they were only able to get to midfield and Walshs 68-yard field goal attempt fell well short to end the game. We led almost all the way, but we cant turn the ball over twice and we cant miss field goals, Bridgewater said. Were just going to continue to try to get better. The Dolphins lead their all-time series with Minnesota by a 6-4 margin, winning the last two. The teams havent played since Sept. 19, 2010 when Miami edged the Vikings, 14-10, in Minneapolis. They havent tussled in South Florida since 2006. WHAT TO WATCH FOR Philbin has been the definition of mediocre as the Dolphins coach, compiling a 7-9 record in 2012 and upping that to 8-8 last season before settling in at 7-7 with two weeks left in the current campaign. A 5-3 start annd some improvement by Tannehill has many thinking Miami was ready to take the next step this season but thats been tempered in the last two weeks as the Dolphins have been outscored by a 69-26 margin in losses to playoff- caliber teams, Baltimore and New England.dddddddddddd Players were disappointed. Coaches are disappointed. Owners are disappointed. I think thats understandable, Philbin admitted. The main issue has been the offense which cant get the running game going and hasnt topped 16 points in any game during the month of December. The Dolphins have mustered only 71 yards on the ground per game this month, making the team one-dimensional and easy to figure out especially when it falls behind. With opposing defenses content to pin their ears back Tanneheill has been sacked 10 times during Miamis two-game skid. The Vikings strength, meanwhile, is its defense, not a surprise considering Zimmers reputation as a blitz doctor. Minnesota has improved from 31st in the NFL to 11th in defense in one-year under Zimmer, who is on the verge of turning young players like defensive end Everson Griffen, defensive tackle Shariff Floyd, linebacker Anthony Barr and cornerback Xavier Rhodes into stars. Safety Harrison Smith, meanwhile, is already entrenched as one of the NFLs best. The unit has continued to be stingy despite being without Floyd and Barr recently due to knee injuries, holding Detroit to a season-low 233 yards. Offensively Minnesota isnt very dynamic because of the year-long absence of Adrian Peterson due to off-the-field issues. Things are starting to click for Bridgewater, though, who will be aiming for a third straight game with a completion percentage over 70.0 and more than 300 yards passing. The good thing is Teddy is getting a lot of these experiences, Zimmer said. The on-the-job training hes getting I really believe will bode well for him in the future and for us as an organization and as a team. Bridgewater, meanwhile, is excited for his chance to play in South Florida. Im pretty loved back home in Miami and a lot of people tell me that Im a role model in my community, Bridgewater said Wednesday. So itll be amazing to see how many turn out there and get to see me play in person for the first time for some people. The Vikings may have found something in first-year receiver Charles Johnson, a lengthy and speedy target who has an innate feel for running routes and creating separation. Johnson has quickly become Bridgewaters favorite target, snaring 20 balls for 355 yards and two TDs over his last five games. The Dolphins defense is talented but has stalled recently, forcing just five turnovers in the past six games as the pass rush has slowed. Miami has also struggled against the run in recent weeks because of injuries at the linebacker position. Part of my job is to get the team to play up to their potential each and every week, Philbin said. To that degree, certainly I feel like we could do better. OVERALL ANALYSIS The Vikings are headed in the right direction but still havent figured out how to close in tight games. Figure on the growing pains to continue here on the road as Miami wins a field-gal game late. Right now whats relevant is getting our team to play up to their potential for 60 minutes against the Minnesota Vikings, the embattled Philbin said. Thats really all that is important to me right now. 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