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".
Huge Qantas Frequent Flyer overhaul
What's more, they will soon have real-time access to reward seats available over the next 12 months shown within five seconds. The Australian airline said it will add more than one million extra reward seats a year on Qantas and new partner airlines.
Tampa Bay's Nikita Kucherov wins Hart Trophy
A standout rookie campaign for Vancouver Canucks forward Elias Pettersson was recognized at the NHL Awards on Wednesday night. He won the Art Ross Trophy for leading the league in scoring with a career-best 41 goals and 87 assists.
Police officer shot while responding to domestic violence call dies
Police say the suspect who has not been identified fired his rifle on and off during an 8-hour standoff before he surrendered. But she added that she "wouldn't want young girls to walk away thinking that this happened because she was a woman".
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.