On a stifling day at U.S. Open, tournament puts a heat policy into play - The Washington Post
Measuring Heat | Tennis and Weather
Wimbledon women to get heat breaks | Wimbledon 2015 | The Guardian
US Open: New heat rule allows players 10-minute break
Australian Open Tennis. Heat safety rules inconvenient? Just change them. | safedesign
ZooTennis: Discussing the ITF's New Junior Heat Rule; Navarro Wins Grade 2 Title in Montreal; Nakashima Reaches Semis at Laguna Niguel Futures; Oracle Masters Update
Why the USTA's attempts to rewrite the tennis rulebook at the US Open have backfired