As well as Jannik Sinner is playing at Wimbledon, he doesn't appear to need much in the way of help. Still, he got some Saturday when his opponent, Pedro Martinez, was dealing with a problematic shoulder and often put in first serves at so-so speeds.

Tennis action begins at 6 a.m. ET with Djokovic, Sinner, and Swiatek all scheduled for center court appearances at Wimbledon.

Novak Djokovic delivered a commanding performance at Wimbledon, signaling his intent to dominate as he eyes a potential semi-final clash with Jannik Sinner.