As well as Jannik Sinner is playing at Wimbledon at the moment, he doesn’t appear to need much in the way of help

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.

Every other day at Wimbledon has brought an opportunity to compare the greatest player in men's tennis and one of his heirs.