Unable to sleep the night before her first-round match at the French Open against No. 2 seed Aryna Sabalenka of Belarus, Marta Kostyuk of Ukraine checked her phone at 5 a.m. Sunday and saw disturbing news back home in Kyiv.

At first, Aryna Sabalenka thought the boos and derisive whistles coming from the French Open crowd were directed at her after a first-round victory Sunday.

"Honestly I don't miss him." The 14-time French Open champion is missing the tournament for the first time in 19 years due to a left hip flexor injury, but there were a few more unique developments on the tournament's opening day.

PARIS (AP) — At first, Aryna Sabalenka thought the boos and derisive whistles coming from the French Open crowd were directed at her after a first-round victory Sunday. Instead, the negative reaction was aimed at her opponent, Marta Kostyuk, for not participating in the usual post-match handshake up at the net.

Both Marta Kostyuk and Aryna Sabalenka said they were surprised by the reaction of some in the crowd at Roland Garros.

The famously fickle Paris crowd made themselves heard on the opening day of the French Open, booing when Ukraine's Marta Kostyuk refused to shake hands after her first-round defeat by Aryna Sabalenka of Belarus on Sunday.

Aryna Sabalenka said she understood Marta Kostyuk's decision to skip customary post-match handshakes with Russian and Belarusian players following Moscow's invasion of her country Ukraine but the player did not deserve jeers from the French Open crowd.