![Switzerland's Roger Federer hits a forehand during a tennis practice session at Melbourne Park January 13, 2009. REUTERS/Mick Tsikas (AUSTRALIA Stock Photo - Alamy Switzerland's Roger Federer hits a forehand during a tennis practice session at Melbourne Park January 13, 2009. REUTERS/Mick Tsikas (AUSTRALIA Stock Photo - Alamy](https://c8.alamy.com/comp/2E8HA78/switzerlands-roger-federer-hits-a-forehand-during-a-tennis-practice-session-at-melbourne-park-january-13-2009-reutersmick-tsikas-australia-2E8HA78.jpg)
Switzerland's Roger Federer hits a forehand during a tennis practice session at Melbourne Park January 13, 2009. REUTERS/Mick Tsikas (AUSTRALIA Stock Photo - Alamy
![New York, USA, August 24, 2018 - US Open Tennis Practice: Maria Sharapova strikes a forehand during practice today at the Billie Jean King National Tennis Center in Flushing Meadows, New York, New York, USA, August 24, 2018 - US Open Tennis Practice: Maria Sharapova strikes a forehand during practice today at the Billie Jean King National Tennis Center in Flushing Meadows, New York,](https://c8.alamy.com/comp/PG8PHM/new-york-usa-august-24-2018-us-open-tennis-practice-maria-sharapova-strikes-a-forehand-during-practice-today-at-the-billie-jean-king-national-tennis-center-in-flushing-meadows-new-york-as-players-prepared-for-the-us-open-which-begins-next-monday-credit-adam-stoltmanalamy-live-news-PG8PHM.jpg)
New York, USA, August 24, 2018 - US Open Tennis Practice: Maria Sharapova strikes a forehand during practice today at the Billie Jean King National Tennis Center in Flushing Meadows, New York,
![Table Tennis Robot training Forehand Backhand Practice Serve Single Multiplayer Tennis Swing Trainer Sparring Teaching Device|Tennis Accessories| - AliExpress Table Tennis Robot training Forehand Backhand Practice Serve Single Multiplayer Tennis Swing Trainer Sparring Teaching Device|Tennis Accessories| - AliExpress](https://ae01.alicdn.com/kf/He7b1865e23c74642bdac97ff5365d447C/Table-Tennis-Robot-training-Forehand-Backhand-Practice-Serve-Single-Multiplayer-Tennis-Swing-Trainer-Sparring-Teaching-Device.jpg_Q90.jpg_.webp)