Australian Open: What is Suspension Rule that has come to play amid Extreme Heat in Melbourne?

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With scorching temperatures forecast for Day 7 at Melbourne Park, peaking near 35°C, the Australian Open organisers kicked off matches an hour early across all courts and activated the tournament's Extreme Heat Protocol. This system ensures player safety amid brutal conditions.

In 2026, the policy's impact was stark amid a brutal heatwave. On January 24, temperatures soared toward 40°C, pushing the Heat Stress Scale to 5 and suspending outdoor play for hours. Matches halted mid-afternoon, affecting dozens of games and forcing rescheduling. Defending champion Jannik Sinner's third-round clash against Eliot Spizzirri was briefly paused on Rod Laver Arena, testing his focus amid the delay.

What is the Heat Stress Rule in Australian Open?

The Australian Open, held amid Melbourne's sweltering summers, prioritizes player safety through its Extreme Heat Policy. This protocol, refined over years, uses a Heat Stress Scale rated from 1 to 5. It considers not just air temperature but also humidity, wind speed, and radiant heat via the Wet Bulb Globe Temperature (WBGT) index.

Unlike simple temperature checks, it factors in four elements - Air temperature, Radiant heat (from the sun), Humidity and Wind speed.

This holistic approach delivers consistent decisions, slashing the risk of heat-related illnesses for players.

What Happens at Each Level?

The tournament referee calls the shots, with escalating measures based on the index. Although the first three index ensures match progressing without any issue, the final two index induces measurements to stop the match or add breaks into it.

Index 4 (as seen today around 1:30 p.m. local time):

Adds a 10-minute cooling break between the second and third sets in women's singles.

Adds a break between the third and fourth sets in men's singles.

No extra breaks if roofs close early on arena courts (e.g., before end of first set in women's or second in men's matches).

Index 5 (maximum heat):

Automatic suspension of play on outdoor courts.

Referee can halt upcoming matches, close roofs on arena courts (or keep them shut), and delay resumption.

Players get at least 30 minutes' notice before play restarts.