He remains risky throughout, and I knew obviously once I gave away that lead things will get very, very tight and they did.
Tsonga fought back from 3-1 down in the second set to go the distance, but Federer claimed the only break of the decider to ensure he will face Roberto Bautista Agut in what will be his 17th quarter-final in as many appearances in Halle.
Alexander Zverev was also a victor over Steve Johnson and Matteo Berrettini finally dropped serve but upended Andreas Seppi to keep his win streak going. "I will have to be aggressive with my return and push him as much as possible", he said.
"I feel I am a better player now than in the past".
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Slack's stock price ended up at $38.62 a share on its first day on the market after reaching a high of $41.95 on a busy Thursday. Mr Butterfield said he thinks that the practice of direct listing has the potential to catch on more widely after this week.
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The airfield will remain closed until further notice, officials said. "The first crews on scene extinguished the fire". The debris field covered an area of about 50 feet by 50 feet.
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But it's unclear how much the industry can benefit, as it faces competition from cheap natural gas and renewable sources. Legal challenges from at least six states and multiple environmental groups are expected.
Climbing through the ranking with constant pace, Roger spent some time in the top-20 before the first Masters 1000 crown in Hamburg 2002 that sent him into the chosen ten, staying there nearly all the time until the end of 2016 when he had to drop out after missing all the action since Wimbledon.
The world number five faces Belgium's David Goffin in the last eight on Friday.
"I am still paying for it a bit after a whole year of not playing. It was bad luck past year because I felt really good on court in every match".
"Obviously my knee is still swollen but the pain is much less than it was a few days ago", he said.
Berrettini, who was crowned champion in Stuttgart last week, came from behind to beat compatriot Andreas Seppi 4-6, 6-3, 6-2 and secure a quarter-final clash with third seeded Russian Karen Khachanov.