A retractable roof was installed to protect the schedule from rain. Closing it also converts the playing environment, and the conditions inside differ from those outside in several ways.
What happens to the air when the roof closes
Sealing the bowl stops air movement, so wind ceases entirely. Ball flight becomes predictable, and serves are no longer pushed off line by gusts.
Humidity rises once a large crowd is enclosed, and the air management system takes time to stabilise it. Damper air is denser and slows the ball slightly.
Temperature typically rises as well, which affects both the ball's internal pressure and the players' physical response. The environment changes gradually rather than instantly.
Why the grass behaves differently indoors
Grass under a closed roof retains moisture that would otherwise evaporate in open air. A slightly damper surface grips the ball more and reduces skid.
Players report that the court plays heavier, with the ball sitting up marginally higher. Rallies extend as a result.
Because moisture also makes the surface more slippery, footing requires more caution. Sliding into shots becomes riskier than in dry conditions.
How lighting alters visual conditions
Artificial light is uniform and constant, removing the shadows and changing brightness that affect outdoor play. Ball tracking becomes easier for players.
The background behind the server is also fixed rather than varying with sky conditions. Depth perception is more consistent.
Some players find the flatter light reduces contrast slightly, particularly on a fast serve. Preferences differ, and adaptation takes a few games.
The procedural questions closing raises
A roof takes time to close and the environment needs further time to stabilise, so play is suspended during the process. That pause is itself a competitive event.
A player leading in deteriorating conditions may lose momentum, while an opponent gains a rest. Deciding when to close is therefore consequential.
The referee makes the decision on defined grounds, principally rain and fading light. Player preference is not a criterion.
How the roof changed the tournament's shape
Scheduling became far more reliable, since at least one court can always continue. Matches that would have been postponed now finish on the day.
Evening sessions became possible, extending play well past natural light. That has altered the character of the second week.
Outside courts remain fully exposed, so the tournament now runs two different weather regimes simultaneously. Draw position affects the conditions a player encounters.
