"Men's Tennis - Davis Cup - World Group 1, Japan vs Colombia" (15th, Ariake Coliseum)

Japan, which had won two consecutive matches, replaced Kei Nishikori Shintaro Mochizuki in the third doubles match and paired him with Yosuke Watanuki. After tying 7-6 and 2-6 after the second set, the heat index (WBGT) exceeded 31°C, the standard for a special response, and the match was suspended in accordance with the tournament's heat rules. The players took a 10-minute off-court break and then began the final third set.

It was a clear day in Tokyo, and the temperature had risen to nearly 35 degrees by 1:00 p.m. when the match started. The roof of the venue, Ariake Coliseum, was left open as the match was held outdoors, letting in sunlight and making it feel even hotter. The WBGT is a standard that calculates the measured values of temperature, humidity, and radiant heat to indicate the risk of heatstroke, and the tournament's heat rules state that special measures such as resting must be taken if the temperature exceeds 31 degrees.

On the 14th, Yoshihito Nishioka won the first singles match at 2pm, but the heat made it a tough environment. He said that the heat rule indicators were exceeded until just before the match, and there was a possibility that the start of the match would be delayed, but the indicators cleared just before 2pm. "I didn't plan on playing until around 12:30 when I was warming up, and it was that hot. The temperature was at the limit. It was pretty tough. Unlike usual, I couldn't move to clear the mark, and if I played full-time from the beginning, I wouldn't have been able to hold out."