The Williams sisters have had mixed performances despite both advancing into the second round of the US Open Tennis Championships. Serena Williams had an easy victory while Venus struggled to avoid elimination. Meanwhile, Nick Kyrgios is already causing some controversy in the men’s division.

Serena Williams cruised to an easy victory, thanks to her superior serve. Despite suffering from a sore shoulder, she defeated Ekaterina Makarova in straight sets 6-3,6-3 in her opening match on Tuesday. “I was pleased with my serve because I haven’t been hitting a lot of serves at all. In practice, none of them were going in, so I was definitely excited about that,” Serena told ESPN.

Meanwhile, her sister Venus Williams also advanced to the second round despite a poor showing at the recently concluded Rio Olympics 2016. She narrowly escaped an upset in the hands of Kateryna Kozlova. The 22-year-old Ukrainian pushed Venus to three sets before finally being defeated at 6-2, 5-7, 6-4.

Former world number one Ana Ivanovic did not fare any better. She made a quick exit out of the US Open. She lost in the first round against unheralded Denisa Allertova of Czech Republic.

Over at the men’s draw, Nick Kyrgios is already causing some controversy. He had a minor altercation with the chair umpire in his first-round match. He defeated British player Aljaz Bedene in straight sets 6-4 6-4 6-4. The match went by quickly, but the highlight was Kyrgios’ outburst.The umpire gave him a code violation for hitting a ball dangerously close to a linesman after a rally. According to FOX Sports, he had some scathing comments for the official and refused to shake hands after the match.   

The Australian is no stranger to controversy. Just last week, he made headlines by revealing that tennis players are allowed to smoke marijuana if they are outside competition dates.