For Novak Djokovic, this is a relatively easy call. He thinks the French Open is making a mistake by eschewing the electronic line-calling used at most big tennis tournaments and instead remaining old school by letting line judges decide whether serves or other shots land in or out.

French Open is the only Grand Slam to continue with line judges and not electronic line-calling, evoking mixed reactions

Novak Djokovic begins his latest bid for a record-breaking 25th Grand Slam singles title with a commanding win over Mackenzie McDonald.