Novak Djokovic has been visited twice by a doctor for a stomach issue and given what he called “miracle pills” during a 6-1, 6-7 (7), 6-2, 6-2 victory over Alexandre Muller in Wimbledon’s first round.

On Tuesday, Novak Djokovic opened his Wimbledon campaign with a 6-1, 6-7, 6-2, 6-2 win over Alexandre Muller. While the scoreline suggests a clear advantage for the Serbian star, the World No. 6 struggled at times during the match, which affected his overall performance.

Novak Djokovic kicked off his 20th Wimbledon with a 6-1, 6-7, 6-2, 6-2 victory over Alexandre Muller in three hours and 19 minutes on Centre Court. The veteran played well in sets he won and notched his 98th Wimbledon triumph, moving closer to a massive milestone.