STANFORD, Calif. -- Matt Besler and Geoff Cameron might hear it from every angle if they were paying any attention or had a moments spare time. They could be reminded every day that this is the first time since 1990 the U.S. heads to a World Cup with no central defenders having played previous minutes in soccers showcase event. And that makes an already daunting task in Group G much more challenging for the Americans, who face Ghana, Portugal and Germany next month in Brazil. The competition for spots on the Americans back line is fierce, leaving no time to analyze the groups inexperience. "For us, theres nothing we can do about it," Besler said before Sundays training at Stanford Stadium. "We cant change the fact that weve never experienced a World Cup. Were looking at it as a great opportunity. Weve never done it before but everyone is excited and really hungry to prove that we belong here and that we can do well." Nobody knows how the foursome will look for the teams World Cup opener June 16 against Ghana in Natal, yet coach Jurgen Klinsmann will get a glimpse during an exhibition against Azerbaijan on Tuesday night at Candlestick Park. He has several choices for each defensive spot. If there are concerns with Omar Gonzalez, who tweaked his left knee during a May 3 game with the Los Angeles Galaxy against Colorado, Klinsmann might go with Cameron in the middle alongside Besler. Gonzalez has since returned to full training. "I think the competition is healthy, and its definitely alive and well here," Gonzalez said. "Before I got injured, I was probably the fittest Ive been in a very long time." Cameron plays right back for Stoke in the Premier League but insists he only needs a couple of reps at centre back in practice, scrimmages or exhibitions to find a groove again. "When youre playing against Man United, Chelsea, Everton, Tottenham, youre playing all the big boys every single weekend against the best competition, theres no room for mental errors, theres no complaining about how tired you are or this or that because the games come so quick," Cameron said. "For me, it was a learning process the first year. As the second year comes, you get more comfortable, youre confident going into the other stadiums." Besler, the 27-year-old Sporting Kansas City star who was the 2012 MLS Defender of the Year, has played in the middle with both Cameron and Gonzalez. Cameron and Besler very well could start in the centre back spots for the opener. Fabian Johnson or Timmy Chandler might play right back, though Johnson said he has seen regular time there. "I played right back in all the scrimmages so Im ready for this position," Johnson said Sunday. DaMarcus Beasley could be on the left as he looks to become the first American to play in four World Cups. "It is different playing with different guys. Everyone has different styles," Besler said. "I think as a team we play the same but when you have different guys back there you have to make little adjustments depending on whos back there. But for me I have experience with both. Ive played in World Cup qualifiers with Geoff, with Omar. I feel comfortable with anyone, really." If midfielder Jermaine Jones is suspended at some point for accumulation of yellow cards, Klinsmann might call upon Johnson in the defensive midfield. While experience on the defence would certainly be preferred at this stage, goalkeeper Tim Howard will help everyone get up to speed. "All things considered, of course youd like to have some guys back there who understand the rhythm and the pacing and the difference of a World Cup," said Alexi Lalas, a starting U.S. defender for the 1994 World Cup, former MLS general manager and current analyst. "This decision was made a long time ago, regardless of the final personnel, you knew you were going to have some World Cup inexperience out there. And we still dont know how the back four is going to look. "With that being decided and the veterans no longer being part of the scene, it was about getting some sort of understanding, communication and comfort with the defence. Thats really a much more important piece considering theres not going to be World Cup experience." Cameron is considered a central defender by Klinsmann. "Ive said that over three years I think his best position is centre back," Klinsmann said. "And its good to know he can play right back, too, and its good to know he can play a No. 6, too. Still I think his best fit, his best game for himself is the centre back role." Klinsmann isnt making a big deal about the teams lack of experience. Only five players among the 23 have appeared in a World Cup. "The plan is to help them in that process, to get in that World Cup with a lot of confidence and being sure that they know what theyre doing. In every training session we will work on those pieces and we will guide them through all the different things that happen during a game, preparing the best way possible for the opponents they face in the group stage already," Klinsmann said of the defence. "Im sure theyre going to be very well prepared and they will be ready for the task. Theres always a first time in life in whatever you do. Its for some the first World Cup, though its the first of hopefully many World Cups to come for them. Im not worried about the inexperience." NOTES: Landon Donovan, cut by Klinsmann on Thursday, broke the Major League Soccer goal record Sunday night. He returned to the LA Galaxy to score his 135th and 136th regular-season goals in a 4-1 victory over the Philadelphia Union. 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MELBOURNE, Australia -- The scorching weather finally brought play to a halt on the fourth day of the Australian Open when the temperature topped 43F (109F), but not soon enough for some players who criticized officials for not stopping matches earlier. The Extreme Heat Policy was enacted at Melbourne Park just before 2 p.m. Thursday, suspending all matches on outer courts until the early evening and requiring the closure of the retractable roofs at Rod Laver and Hisense arenas before play could continue on the show courts. It was the first time since 2009 play had been halted due to heat at the Australian Open. For Maria Sharapova, playing at Rod Laver Arena, the call came too late. The rule dictates the roof cant be closed until the end of a set in progress, so she was forced to finish a grueling third set against Italian Karin Knapp under the blazing sun. "Everyone knows there is no tiebreaker in the third set (at the Australian Open), so once you start that set, youre going to be out there until youre done," she said after closing out the 3 1/2-hour match, 6-3, 4-6, 10-8. Other players wilted in the heat. American Varvara Lepchenko received medical treatment during her match against 11th-seeded Romanian Simona Halep, lying flat on her back during a changeover as trainers rubbed iced on her body. "At first I didnt understand what was going on but then my legs, my arms started to get heavier. I couldnt focus at one point and started feeling dizzier and dizzier," she said. She continued but only won one more game in a 4-6, 6-0, 6-1 defeat. "They definitely should have just not started the matches in the first place," she said. ";And the same goes for a couple of days ago when I played my (first) match.dddddddddddd" The heat wave began Tuesday when the temperature peaked at 42C (108F). The tournament referee did not halt play then because the Extreme Heat Policy also takes into account other factors, such as humidity and wind speed. The distinction is lost on the players, who have grumbled all week about the conditions which some have described as inhumane and dangerous. On Tuesday, Canadian Frank Dancevic blacked out and hallucinated during his match, while Chinas Peng Shuai vomited and suffered cramps. No. 25-seeded Alize Cornet of France sobbed on court Thursday after her draining 6-3, 4-6, 6-4 victory over Italian Camila Giorgi, then blasted officials for not halting play sooner. "On Tuesday, I dont know why they didnt stop matches," she said. "It was an oven. An oven. It was burning. Why today and not Tuesday?" The heat hasnt just affected players -- its also kept fans away. Total attendance was just 49,860 on Wednesday, down from Mondays high of 63,595. The unshaded seats on the outer courts were virtually empty Thursday, with spectators congregating under trees or in the upper reaches of stands where temporary covers provided a little relief. New Zealander Helen Naylor escaped the sun after watching fellow Kiwi Marina Erakovic play for a bit on Court 13. "Even the seats are really hot -- God knows how (the players) are running around out there." Relief is as least in sight. Friday will be another scorcher, with an expected high of 44C (111F), but Saturday it will only reach 23C (73F). That may feel downright chilly by comparison. ' ' '