Family concerns give Sock new perspective on game

Jack Sock on Saturday became the youngest American man to reach the French Open last-16 since Pete Sampras 22 years ago, with a spirit fired by a pair of frightening family health scares.

At the start of the year, Sock, the world No 37, was at the bedside of his older brother Eric, who had been diagnosed with Lemierre's Syndrome.

The rare disease, caused when an infection from a sore throat builds in the lungs, could have been fatal.