SAO PAULO (AP)—The American twins Bob and Mike Bryan have withdrawn from the Brasil Open next week because of an injury to Bob’s left shoulder.

Tournament organizers said Wednesday that Bob will be out for up to a month after being injured playing mixed-doubles at the Australian Open last month.

Organizers said Bob played the final three matches at the Australian Open only after “taking high doses of pain medication.” The brothers were coming off their fifth Australian Open doubles title and 10th Grand Slam championship.

It would’ve been the first time the brothers played in the ATP tournament in Brazil.