seeded No. 2, becomes the favorite as he bids to become the fir

SEATTLE -- Struggling starter Taijuan Walker has been optioned to the minors by the Seattle Mariners in a move the club hopes will jump-start his sluggish performances on the mound.The Mariners made the surprising move Monday to open a spot on the 25-man roster for recently acquired reliever Arquimedes Caminero.Walker made his first start in a month last Saturday but allowed six runs in four innings against the Angels.Walker missed most of July because of tendinitis in his right foot and made only one rehab start in the minors before rejoining the Mariners. He is 4-7 with a 4.10 ERA.Seattle manager Scott Servais said the club is sending a message to Walker with the move, saying that with the Mariners in the wild-card chase they need more consistency from the young right-hander. Servais said Ariel Miranda will take Walkers spot in the rotation and pitch this weekend in Oakland. Ed Oliver Jersey . 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Devin Singletary Youth Jersey . -- Stanfords Kevin Danser knelt on one knee and hardly moved on the sideline as Michigan State celebrated its Rose Bowl victory and his Cardinal teammates made their way to the locker room. RIO DE JANEIRO -- Novak Djokovic shook his head and placed his palm over welling eyes on his way to the locker room after a first-round Olympic exit, devastated he might never realize his goal of adding a gold in singles to a substantial collection of Grand Slam titles.I mean, no doubt, its one of the toughest losses in my life, in my career, Djokovic said later, shaking his head and speaking in subdued tones. Not easy to handle.The Serb was hardly alone in his disappointment on Day 2 of the Rio de Janeiro Games: He was one of three No. 1 seeds to exit the tennis competition in a wild span of 12 hours.Djokovics 7-6 (4), 7-6 (2) setback Sunday night was caused in large part by ferocious forehand after ferocious forehand from a resurgent Juan Martin del Potro of Argentina. That surprising result followed losses by the top-seeded duos of Serena and Venus Williams of the United States -- who entered their match with a 15-0 Olympic record and three gold medals as a pair -- in womens doubles, and Nicolas Mahut and Pierre-Hugues Herbert of France in mens doubles.The second-seeded mens doubles duo of Andy and Jamie Murray departed, too.Got to take it on the chin, said Jamie, the older brother of two-time Wimbledon winner Andy, and move on.Sunday began with 25 mph winds that delayed the start of play on eight of Rios nine tennis courts for about 2 hours, and then came so many startling outcomes.None was more significant than 2009 U.S. Open titlist del Potros victory over 12-time major champion and No. 1-ranked Djokovic in a thriller before a raucous crowd. The match concluded with both men, who are friends, wiping away tears after a lengthy, warm embrace at the net, during which Djokovic offered what del Potro described as really kind words.Del Potro has dealt with three operations to his left wrist that kept him off the Grand Slam circuit for 2 1/2 years, until Wimbledon last month, and even he acknowledged: I didnt expect to beat Novak tonight.Djokovic had won seven of their eight most recent meetings, and 11 of 14 overall, before Sunday. But this is the second time that del Potro came out ahead at an Olympics: He beat Djokovic to take the bronze medal in London four years ago.Representing Serbia means a lot to DDjokovic, who led his country to a Davis Cup title and carried its flag at the opening ceremony of the 2012 Games.dddddddddddd He did earn a bronze at the 2008 Beijing Olympics, but to a guy with so much success, anything other than being the champion is not acceptable.There is still a shot at gold in doubles in Rio -- he and Nenad Zimonjic are into the second round -- but as for singles, Djokovic will be 33 by the time Tokyo hosts the 2020 Olympics.The wounds are still fresh, Djokovic said. But youve got to deal with it. Its not the first (or) the last time that Im losing a tennis match. But Olympic Games, yeah, its completely different.This comes a little more than a month after a third-round loss at Wimbledon against Sam Querrey of the United States, and could add to the sense that Djokovic is not as unbeatable as everyone was beginning to think he was when he won the French Open in June to become the first man in nearly a half-century to win four consecutive major trophies.With Djokovic out of the draw, 2012 gold medalist Andy Murray, who is seeded No. 2, becomes the favorite as he bids to become the first player to win consecutive Olympic singles titles. He won his opener in that event Sunday, 6-3, 6-2 against Serbias Viktor Troicki.Also chasing a repeat in singles: Serena Williams, who was the only No. 1 seed with a victory Sunday, albeit a patchy one, 6-4, 6-2 against Australias Daria Gavrilova in singles.Then Serena went back out on court to partner Venus, who has been ill and lost in singles on Saturday. They were beaten 6-3, 6-4 by the Czech Republics Lucie Safarova and Barbora Strycova.We played terrible, Serena said, and it showed in the results.A common theme on this day.After he and Jamie wasted five set points in the second tiebreaker of their 7-6 (6), 7-6 (14) loss against Brazils Thomaz Bellucci and Andre Sa, Andy said he would skip mixed doubles and let his brother play with Jo Konta.Ill concentrate on the singles now, Andy said. Ill get a day off tomorrow and recover. Its been a long day.---Follow Howard Fendrich on Twitter at http://twitter.com/HowardFendrich ' ' '