Nadal tore his abdominal muscle by 7 mm and withdrew from the Wimbledon semi-final. Is his injury serious?

Seriously, the abdominal muscle tear was the reason why Nadal decided to retire. In a final of 1/4, which lasted 4 hours 2 1 min and played 5 sets, Nadal resisted the pain of abdominal muscle tearing and struggled to beat American player Fritz. After the game, Spanish media reported that Nadal tore his abdominal muscle by 7 mm, but he still intends to continue to participate in the next semi-final. In fact, Nadal also appeared on the training ground on Thursday, local time, but during the 45-minute training, it was obvious that his serve was affected by injuries and his ball speed was greatly reduced. ? I can't serve, and I can't serve with normal movements. ?