CAMPINAS, Brazil -- Cristiano Ronaldo again wore a brace on his troublesome left knee Friday, triggering a new wave of questions over his health as his Portugal team held its final World Cup training session before departing for a crucial game against the United States. The reigning world player of the year took part in some light workouts with the first team, followed by stretching. He was smiling and appeared at ease at practice at the team base in Campinas, northwest of Sao Paulo, as he took part in a playful game of keep away from teammates. The team was set to leave later in the day for Manaus for its matchup with the U.S. on Sunday. Portugal was humiliated in a 4-0 defeat by Germany in their opener. Another loss and the fourth-ranked team in the world could be eliminated even before its final Group G game against Ghana. Ronaldo has been hampered by tendinitis and a muscle injury since before the tournament, creating plenty of speculation about how he would perform in Brazil. He was doubtful to play before the Germany game, but declared himself fit and went on to produce a subdued performance that only added to the usual drama and scrutiny surrounding the player. Team officials dismissed reports suggesting that Ronaldo could be risking his health by playing, saying they were tired of having to deny every rumour about a player many consider to be the worlds best. They noted, however, that he often plays with a brace and said hes healthy and would play against the U.S. Teammate Helder Postiga also expressed frustration over the media circus around Ronaldo. "I have already answered so many questions about Cristiano Ronaldo. Actually we speak about him every day. If I am sick of it, imagine how he is feeling," Postiga said. "If he is available enough to train with us thats probably because he is feeling well. Hes been training with us all these days and as usual he always gives his best. Hes just fine." Ronaldo has been one of the best players in the world for about a decade, and last year he even passed Lionel Messi by ending the Argentina forwards streak of winning the FIFA Ballon dOr. He has also excelled on the world stage, helping Portugal reach the 2004 European Championship final and the 2006 World Cup semifinals. The team also advanced out of the group stage at both Euro 2008 and the last World Cup, and then reached the semifinals at Euro 2012. Although he is Portugals all-time record scorer with 49 goals in 111 appearances, Ronaldo scored just twice in the last two World Cups. Robin Lopez Jersey . Kyle Denbrook, a soccer player from Saint Marys University, took the CIS male athlete of the week honour. Stanley, a fourth-year business administration student from Charlottetown, scored both goals in a 2-0 win over Dalhousie on Friday and tallied again in a 1-0 win over Saint Marys on Sunday. Lauri Markkanen Jersey . 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"Dud is a shooter.DUESSELDORF, Germany -- Ivo Karlovic of Croatia advanced to the Duesseldorf Open semifinals on Thursday, hitting 19 aces in a 6-4, 3-6, 6-3 win over defending champion Juan Monaco of Argentina. The seventh-seeded Karlovic will meet Jiri Vesely of the Czech Republic on Friday. Vesely spoiled Jurgen Melzers 33rd birthday by beating the Austrian 6-1, 6-1 to advance to his first ATP semifinal. Melzer is playing again after misssing seven months with a shoulder injury.dddddddddddd Denis Istomin of Russia upset third-seeded Andreas Seppi of Italy 6-3, 6-4 to record his 150th career win. The match between top-seeded Philipp Kohlschreiber of Germany and qualifier Mate Delic of Croatia was interrupted twice by rain and finally abandoned because of darkness, with Kohlschreiber leading 7-5, 4-4. Delic is in his first tour-level event. 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