ROME (AP) — Four-game sets. A clock counting down between points. No lets. And free crowd movement during matches. A whole new set of tennis rules will be tested by the ATP Tour during a new ...

The problem is that what you can’t see can still pose a significant risk to patient safety. Adenosine triphosphate (ATP) is found in all living cells, from bacteria to blood to human skin cells. Its ...

It was the first time an ATP sanitation verification system was submitted for approval. It follows a study by NSF International that showed it exceeded the performance of competitive system, said the ...

And free crowd movement during matches. A whole new set of tennis rules will be tested by the ATP Tour during a new season-ending tournament for the top 21-and-under players in Milan in November.

LONDON -- The men's ATP tour will try to shake up doubles tennis by trialing changes including a 15-second serve clock and reserving slots for teams to enter tournaments using their singles rankings.

LONDON — There won’t be anyone for players to argue calls with at this tennis tournament: They’re getting rid of the line judges entirely. The men’s tour announced Monday that the Next Gen ATP Finals, ...