Sportswear giant Adidas-Salomon is leading in its crunch match against the International Tennis Federation at the UK High Court.
The German-headquartered company has won the right (for now) for players to wear its distinctive three stripes at the upcoming Wimbledon tournament in London.
The ITF is trying to enforce new rules that say size does matter and to prevent players looking like "walking advertising hoardings". It declared that the Adidas logo constituted a "manufacturer's identification".
This was previously deemed to be part of the design and thus immune from the rules. But Adidas told the court it did not have time to reduce the size of the logo before the opening of the championships, which begin on June 26.
After the hearing the company said: "We would have been greatly prejudiced by the proposed interpretation of the dress rule . . . it was only with great reluctance and as a last resort that we resorted to legal proceedings."
The final of this game will be played out in October when the two sides meet again in a court [of law].
Data sourced from BBC Online; additional content by WARC staff