A reader writes in, defending the service let rule. Plus, a Saudi update, Madison Keys’s Hall of Fame case and Jannik ...

Jannik Sinner successfully defended the Australian Open title. World no. 1 dropped two sets in seven encounters in Melbourne, lifting a trophy in style and becoming the three-time Major winner at 23.

Great servers have realized that power and pace are not the end-all and be-all, and that their killer shots must be backed up with a solid return game.