Federer), and winning two International Series titles in Pörtschach (def. Mónaco) and Warsaw (def. Robredo), and his second career Masters shield in Miami (def. Nadal). The last three qualifiers, who locked their spots during the final event before the year-end championships, at the Paris Masters, were Andy Roddick of the United States, qualified for the sixth straight year (withdrew in 2005) on October 30, Juan Martín del Potro of Argentina, and Jo-Wilfried Tsonga of France, who both qualified in the last two days of the event and ended in the Top Eight for the first time. Andy Roddick did not perform as well as in previous seasons in Grand Slam tournaments, exiting in the third round of the Australian Open (lost to Kohlschreiber), withdrawing from the 2008 French Open (due to a right shoulder injury contracted in the semifinals of the Rome Masters), crashing in a four-setter in the second round of Wimbledon (lost to Tipsarević), and matching his 2007 US Open performance with a quarterfinal in New York (lost to Djokovic). During the rest of the season, Roddick lost one final in Los Angeles (lost to del Potro), and captured three titles in San Jose (def. Štěpánek), Dubai (def. López), and Beijing (def. Sela), clinching the qualification when he reached the quarterfinals of the Paris Masters. Juan Martín del Potro lost in the second round of all first three majors; at the Australian Open (lost to Ferrer), the French Open (lost to Bolelli), and Wimbledon (lost to Wawrinka). After Wimbledon, del Potro went on to win his first four titles in as many tournaments in Stuttgart (def. Gasquet), Kitzbühel (def Melzer), Los Angeles (def. Roddick) and Washington (def. Troicki), becoming the first player ever to do so. In the rest of the year, del Potro extended his 23-match streak to the quarterfinals of the US Open (lost to Murray), and reached another final in Tokyo (lost to Berdych). Del Potro's qualification came during the Paris Masters, when Tsonga defeated other Masters Cup hopeful James Blake, the only other contender for del Potro's place, in the semifinals. Jo-Wilfried Tsonga, ranked 38 on January 1, defeated Murray, Gasquet and Nadal en route to his first final in the ATP Tour at the Australian Open (lost to Djokovic). Sidelined during three months of the season due to a right knee injury, Tsonga missed both the French Open and Wimbledon, coming back to