The question has circled the sport of professional tennis for the past several years, ever since a one-time wunderkind ranked in the worldwide top 10 started plummeting. Whatever happened to Jack Sock ...

Jack Sock has had the sort of tennis career that most players can only dream of — an Olympic gold and bronze medal in 2016, as well as career-high worldwide rankings of No. 8 in singles and No. 2 in ...

— -- Two of the top young American contenders will try to advance to the third round of the Australian Open on Thursday, both with tough but not impossible matches. But the local buzz Down Under ...