MI5 soon discovered that the two main instigators of the successful attack, Mohammad Sidique Khan and Shehzad Tanweer, had crossed their path before, particularly on the fringes of Operation Crevice.
For years Federer and Nadal have stood together as a kind of classy firewall against the creep of corruption and boorishness that oozes into nearly every crevice of professional sports.
The picture from a passport found at the site was circulated among surveillance staff, who identified Khan as one of those seen during Operation Crevice.