Consent of the data subject is only one of several conditions that allow the processing of personal data; these are found at Article 6(1) of Regulation 2016/679. The last, item (f), is also of interest:
Lawfulness of processing
- Processing shall be lawful only if and to the extent that at least one of the following applies:
(a) the data subject has given consent to the processing of his or her personal data for one or more specific purposes;
(b) processing is necessary for the performance of a contract to which the data subject is party or in order to take steps at the request of the data subject prior to entering into a contract;
(c) processing is necessary for compliance with a legal obligation to which the controller is subject;
(d) processing is necessary in order to protect the vital interests of the data subject or of another natural person;
(e) processing is necessary for the performance of a task carried out in the public interest or in the exercise of official authority vested in the controller;
(f) processing is necessary for the purposes of the legitimate interests pursued by the controller or by a third party, except where such interests are overridden by the interests or fundamental rights and freedoms of the data subject which require protection of personal data, in particular where the data subject is a child.
Point (f) of the first subparagraph shall not apply to processing carried out by public authorities in the performance of their tasks.
Most sports statistics systems maintain identifying data for legitimate purposes pursued by the systems' owners. Since the data in question are already publicly available, and in many cases are made public by the athletes in the course of their lives as public figures, it is unlikely that a court would find that the athletes' interests or fundamental rights and freedoms override the interests of the systems' owners in processing the data.