Jan. 21, 2026 A major global study suggests that a hidden mismatch between two common blood tests could quietly signal serious trouble ahead. When results from creatinine and cystatin C—two markers ...

Stefanos Tsitsipas was already the youngest player ever to have tour-level wins over Roger Federer, Rafael Nadal and Novak Djokovic, completing the set at age 20. On Sunday, the 22-year-old attempted ...