Naomi Osaka won two of her four Grand Slam titles at the U.S. Open so might normally be considered a true contender to leave New York with another. She has not been at her best, however, entering her first-round showdown against Australian Open runner-up Danielle Collins on Tuesday night. Osaka, a former No. 1 now at No. 44, is on a three-match losing streak and is 2-6 since the start of April. “I feel like I would have lied, like, a day ago or so and said that I was really relaxed. But actually, when I practiced today, I felt very anxious,” Osaka said Saturday. “I think it’s ’cause I really want to do well, ’cause I feel I haven’t been doing well lately. I don’t know. It’s tough. Like, of course, you don’t want to lose in the first round of a Slam.”