LONDON, July 8 : Taylor Fritz said he was blindsided and briefly in a state of panic when a chronic right knee problem flared up early in his straight-sets Wimbledon quarter-final defeat by second seed Alexander Zverev on Wednesday.Fritz arrived for the Court One encounter having beaten his German opponent in their previous seven clashes but was hampered by tendonitis and needed treatment at the start of the second set before going down 6-4 6-4 6-2."I feel like three games in the match, he was already up a break, but ... I started feeling my knee. I think I could have, still probably think I could have played a lot better through the issue," Fritz told reporters."I don't know what kind of difference it would have made in the match. He's going to be extremely tough to beat the way he's serv