As the Australian Open 2026 unfolds, players and fans alike should be familiar with some intricate rules that govern the game. Tennis, while fundamentally straightforward—players hit a ball over a net—has many peculiarities in its rules and scoring, which have evolved over time to enhance fairness, safety, and clarity.
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Foot faults occur when the server's foot touches the baseline, the court inside the baseline, or the wrong side of the center mark before the ball is struck. At the Australian Open, these are determined using automated line-calling technology. A foot fault results in the loss of that serve, changing a first serve to a second or a second serve to a double fault.
The introduction of a 25-second shot clock at Australian Open 2018 regulates the time allowed between points, replacing the previous system reliant on chair umpires’ discretion. The clock starts once a point ends, and failure to serve within the time limit leads to violations, starting with a warning.
The hindrance rule prevents players from interfering with their opponent’s ability to play. If interference is deliberate, such as shouting or other distractions, the offending player loses the point. An unusual case occurred at United Cup 2026, when a ball fell from Flavio Cobolli's pocket during a rally; he had to concede the point as it was judged not to be a hindrance against himself.
Coaching became permissible at the Australian Open 2023 under strict conditions, allowing coaches to give brief verbal instructions and use hand signals during matches. Violations are penalized progressively, starting with a warning and leading to point penalties and potentially a game loss.
Players can display up to two commercial logos on their attire, with restrictions on size and placement, while manufacturer logos have separate allowances. This can create the appearance that players have more sponsor logos due to the distinctions in branding rules.
Abuse of balls or racquets is taken seriously, with penalties escalating from warnings to disqualifications, especially if a player injures an official or poses a danger to others.
Regarding medical treatments, players may receive limited treatment during set breaks, but medical time-outs require a doctor’s approval. Players are allowed one medical time-out for each distinct treatable condition, but not for issues like fatigue.
In women’s singles, each player is entitled to one toilet break per match at set breaks. Men’s singles players have two breaks due to the best-of-five format. However, players risk penalties for delays and cannot combine toilet breaks with medical time-outs without consent.
With the advent of full electronic line calling, players no longer utilize challenges; all calls are final, a significant shift that can surprise fans, especially with close calls.