NEW YORK -- Two 23-year-olds, Milos Raonic and Grigor Dimitrov, broke through to their first major semifinals at Wimbledon. Perhaps this years U.S. Open will be the tipping point for the rise of a new generation. But recent history suggests that if somebody other than the "Big 4" wins, a veteran may be more likely. "We didnt have many young players who were able to challenge for top spots and win Grand Slam titles," Wimbledon champ Novak Djokovic said. "So this is something that is happening now, but its still a long way to the Grand Slam title. Its not something that can happen overnight." It was then-28-year-old Stan Wawrinka who snapped the streak of 16 straight Grand Slam titles by Djokovic, Roger Federer, Rafael Nadal and Andy Murray when he won the Australian Open in January. The only other men in the U.S. Open field who have reached a major final in the last five years are 32-year-old David Ferrer and 28-year-old Tomas Berdych. The U.S. Open starts Monday with Djokovic, Murray, Wawrinka, Maria Sharapova and Venus Williams among the big names on the court. The player with the most impressive performance leading to this tournament was 29-year-old Jo-Wilfried Tsonga. Tsonga, the runner-up at the 2008 Australian Open, beat Djokovic, Murray, Dimitrov and Federer to win the title at Toronto this month. As the sport became more physical, Grand Slam titles became less likely not only for teenagers but for players in their early 20s. "Everybody realizes that youre reaching your peak physically maybe a little bit later and then theyre staying there longer, because they have the technology and theyre more systematic about their training," said Patrick McEnroe, the U.S. Tennis Associations general manager of player development. So a group of players not that young by tennis standards has gained little experience of playing in the highest-pressure moments. The oft-repeated stat is that the Big 4 have won 36 of the last 38 Grand Slam titles. Contrast that to the five years before Nadal won his first major championships at the 2005 French Open to start that streak. As Pete Sampras reign was ending and Federers beginning, 12 different players won the 20 Grand Slam titles; for six of them, it would be their only major championship. Now, its daunting not just to win championships but to even get close to them. Since Murray reached his first major semifinal at the 2008 U.S. Open, the Big 4 have hogged 63 of the 96 slots in the semis. And since the 2006 French Open, the first Federer-Nadal major final, theyve filled 58 of the 68 spots in Grand Slam title matches. Nobody else reached a major final for 10 straight events from the 2010 U.S. Open to the 2013 Australian Open. "Its definitely been a tough time for everybody else trying to break through," Raonic said. Especially younger players. Of the eight other men to play in Grand Slam title matches since the 2006 French, only Tsonga and Juan Martin del Potro were under age 24. "I was really impatient -- I wanted things to happen quick for me, just wanted to achieve right way," Dimitrov said. "I cant forget that nowadays the game has changed so much that nothing happens like that," he added, snapping his fingers. A 20-year-old del Potro stunned Federer in the 2009 U.S. Open final, seemingly heralding the arrival of a new generation. It wasnt to be. Del Potro, now 25, has been hampered by injuries and wont play in New York this year because of a wrist problem. He and his contemporaries are a glaring omission from the upper echelons of the sport. The rankings current top 10 include the two 23-year-olds, Raonic and Dimitrov; no one else is under 27. Other promising players in their mid-20s such as Kei Nishikori, Ernests Gulbis and Marin Cilic have never maintained a consistent high level. Djokovic and Murray were born a week apart in 1987; Nadal is less than a year older. If they can stay healthy -- certainly a big "if" with Nadal -- the logjam at the top could stick for a while. Yeezy Boost 550 Deutschland . PETERSBURG, Fla. Ultra Boost Günstig Kaufen . - Jacksonville Jaguars defensive end Jason Babin is now a free agent. http://www.yeezyschuhe.de/ultra-boost-schuhe.html. It led to his downfall on Tuesday. The Major League Soccer club fired Rennie after a second straight up-and-down season that saw the Whitecaps start strong before limping across the finish line. Yeezy Schuhe Großhandel . Thaddeus Young scored seven of his 25 points in the fourth quarter, Evan Turner added 22 points, and the 76ers hung on for their first road win since Nov. 1, beating the depleted Los Angeles Lakers 111-104 on Sunday night. Nmd Schuhe Günstig Kaufen . The first of the three games will be played in Week 4, when the Oakland Raiders will take on the Miami Dolphins on Sept.MELBOURNE, Australia - Juan Martin del Potros injury time-off from Grand Slam tournaments just got a little longer.The 2009 U.S. Open winner withdrew Sunday from the Australian Open on the eve of the tournament to avoid re-injuring a surgically-repaired wrist that he said had been hurting him for the last couple days and weeks.The 26-year-old Argentine was one of the most significant absentees from the mens game for much of last season, which he spent recovering from major left wrist surgery after bouncing back from right wrist surgery in 2010. He hasnt played at a major since Melbourne last year, where he lost in the second round.Nothing new. Nothing dangerous. But I think my wrist is not ready for playing in this important tournament, del Potro told a media conference, after cutting short a practice session. It was a tough ddecision but could be a smart decision if I want to stay healthy and play for the whole year.dddddddddddd.Del Potro made it the quarterfinals of the Sydney International last week, his first tournament after 11 months off the tour.I really enjoyed playing tennis again last week in Sydney, winning a couple matches. I didnt expect that for sure, said del Potro, who had a career-high ranking of No. 4 in 2010 but has slipped to 276th.Del Potro said he would consult with his doctor and hoped to return to tournaments very, very soon.Del Potro had drawn one of the toughest first-round assignments in Melbourne against 24-year-old Jerzy Janowicz, who won last weeks Hopman Cup team event with Poland teammate Agnieszka Radwanska.Janowicz will now play 24-year-old lucky-loser Hiroki Moriya, a Japanese player ranked 146th. ' ' '