At the 2026 US Open, line calls on every court are made in real time by an electronic system. The chair umpire remains in charge of the match, but the familiar team of line judges is no longer responsible for deciding whether a ball landed in or out.
What the system decides
Live electronic line calling tracks the ball and produces an immediate call. Foot faults are monitored separately by a certified review official using court-level cameras.
Video Review serves another purpose. It can help with judgment incidents such as a double bounce, a player touching the net, a ball passing through rather than over the net, a hindrance, a scoring error or a malfunction of the line-calling system.
Overturned or upheld
The chair umpire needs clear and irrefutable video evidence to overturn the original decision. If the footage confirms the call—or does not clearly settle the question—the decision is upheld. Video review is therefore not a general replay of every point.
Tiebreak reminder
A standard set reaching 6-6 uses a first-to-seven tiebreak, won by two. At 6-6 in a deciding set, all four Grand Slams use a first-to-10 tiebreak, again requiring a two-point margin.
The official US Open 101 guide explains the tournament's officiating and scoring. Also see our US Open finals guide and Sports section.
