My tennis reads of the week:

Ivo Karlovic is almost 40 years old. He just reached the ATP final in Pune, losing to Kevin Anderson (Tennisabstract.com)

Novak Djokovic went back his old serve and became No. 1 again(Fivethirtyeight.com)

Andy Murray undergoes hip surgery to save his career (ESPN)

Chinese teenage star fires coach over dispute with his mom (Yahoo Sports)

Athletes like Lebron James and Frances Tiafoe are using pickle juice to boost performance (BBC)

Behind the racket smashing on-court tennis player, a calm solitary man – Meet Benoît Paire (Longreads)

Davis Cup format changes have riled many players and fans, including Lleyton Hewitt (Yahoo Sports)