Novak Djokovic 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.

Novak Djokovic endured windy, wet weather to get past American Mackie McDonald, 6-3, 6-3, 6-3 in first round French Open action Tuesday. Alexander Zverev also won, while Danil Medvedev lost after a nearly 4-hour match against Cameron Norrie.

Novak Djokovic has returned to Roland-Garros with a 6-3, 6-3, 6-3 victory over Mackie McDonald in the first round.