Serena draws U.S. Open crowd; Nadal eyes No. 1; Osaka anxious

The 23-time Grand Slam champion did not break stride

Serena Williams rose from her sideline seat after a break during a training session inside Arthur Ashe Stadium, and as she walked to the baseline at the end of the court covered by shade on a steamy morning, a few voices from the stands called out in unison, "Serena, we love you!"

About to hit some serves in preparation for the first round of the U.S. Open on Monday night — and what could wind up being the last singles match of her career — the 23-time Grand Slam champion did not break stride, although she did turn her head in the fans’ direction, acknowledging the sentiment with a smile.

Later, there were similar cries from the crowd and a couple of rounds of applause for Williams, who is also entered in doubles after she and her older sister, Venus, were given a wild-card entry by the U.S. Tennis Association.

"It's the end of a great career. And hopefully she can finish it off feeling good about herself and enjoying the moment and enjoying the crowd and listening to the people, to everyone, saying how much they love her," said Rennae Stubbs, who won four Slam titles in women’s doubles and has been working with Williams, alongside coach Eric Hechtman, since last week.

"She responds to that in a positive way and not in a negative way. She embraces it. My goal is to have her hopefully enjoy this moment.” With the temperature in the 80s and not a trace of a breeze, Williams was out there a little less than an hour, pausing at one point to eat some fruit. This followed an earlier hitting session on a smaller practice court adjacent to Ashe.

"We've been friends for a long time. I’ve helped her and advised her in ways before. She just wanted a friendly voice around her. I’m her friend and she knows that I know tennis," said Stubbs, whose previous coaching included time with another former No. 1, two-time major finalist Karolina Pliskova.