LONDON - Lleyton Hewitt reached his first semifinals in 11 months by upsetting third-seeded Juan Martin del Potro 6-2, 2-6, 6-2 at Queens Club on Friday. The former four-time champion took a 4-2 lead with a backhand winner after del Potro struck consecutive double-faults, and hit a backhand volley to break again for the set. Del Potro sped to a 4-0 lead in winning the second set. In the decider, Hewitt broke del Potro at love to earn a 3-1 lead and broke again at 5-2 with a volley winner. Hewitt will next play No. 5 seed and defending champion Marin Cilic, who upset No. 2 Tomas Berdych 7-5, 7-6 (4). Cilic was under pressure in both sets. He faced a break point at 4-4 but Berdych netted his return, and Cilic failed to convert two set points at 5-4 before Berdych made a forehand error on a third break point at 6-5. In the second set, Berdych held one break point at 2-2 and another at 4-4, but Cilic once again held off the threat before claiming victory in the tiebreaker. 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Crouched behind the 10th green at Sheshan International, McDowell looked over at the powerful American and said, "Ive probably seen 18 of the best drives Ive seen all year in the last two days. Purdue coach Darrell Hazell knows his team must find solutions.The Boilermakers defense cant continue struggling to get off the field on third down. It cant continue to let opponents run for 4.7 yards per carry, and Purdue certainly cant afford to have David Blough throw five interceptions.So after spending the bye week seeking answers, Hazell expects to see some changes Saturday against Nevada.You cant let one game turn into two games of doing those things, Hazell said.Blough threw five interceptions two weeks ago in a 38-20 loss to Cincinnati and now faces a Wolf Pack defense ranked No. 8 in the nation. And turnovers are only one issue for the Boilermakers.Hazell went into the bye week contemplating possible defensive changes. He decided against making any moves even though Purdue (1-1) has allowed a Big Ten-worst 31.0 points per game and allowed opponents to convert a league-worst 56.1 percent of third-down attempts.And Nevada (2-1) can run the ball.Junior James Butler already has two 100-yard games this season and freshman Jaxson Kincaide came up one yard short of cracking the 100-yard mark in last weeks win over Buffalo.Theyre committed to running the football. They got a really good back (Butler). Hes quick, hes got really good vision, he makes a lot of people miss in the backfield, Hazell said. Thats probably what our No. 1 goal is, to stop him.Here are some other things to watch Saturday:POLIANS BACK: Nevada coach Brian Polian is making his second trip to the Hoosier State this month. Two weeks ago, his team lost at Notre Dame. This week, the son of the former Indianapolis Colts president and general manager Bill Polian hopes to leaad the Wolf Pack to their second win in six tries against a Big Ten foe.dddddddddddd Nevadas first win came 10 years ago at Northwestern.GETTING HEALTHY: The best news for Purdue may be that a week off gave some key players a chance to heal. Hazell expects running back Markell Jones back after he injured his shoulder two weeks ago. He also listed starting cornerback DaWan Hunte and starting defensive end Austin Larkin as probable.THREE FOR THE SHOW: As if Nevadas opening stretch hasnt been tough enough -- traveling to Indiana twice in four weeks and Hawaii next week -- there is this: Purdue will be the second straight opponent and third this season that has had more than a week to prepare for the game. Buffalo and Purdue both had bye weeks before playing Nevada. Of course, Cal Poly, Nevadas season-opening opponent had a whole offseason to get ready for the Wolf Pack. Hawaii has a bye this week.HOLDING ON: So far, the Boilermakers offensive line has stood up to the challenge, allowing no sacks through the first two games. The last time that happened came in 2004 against Ball State and Syracuse. But going sack-free again could be imminently more difficult Saturday. Right tackle Matt McCann injured an ankle at practice Tuesday and is unlikely to play, and left tackle Martesse Patterson is dealing with personal issues and may not play either.RED FLAG: One advantage for Purdue could be red-zone success. Nevadas first three opponents have moved inside the 20-yard line 11 times -- and have scored on all 11 possessions. ' ' '