She's going to start playing better, getting first serves in and move her feet, so she gets into proper position to hit her thunderous forehands and backhands.
"Every ball I hit seemed to be going out," said Williams. "And I even had the easiest approach shot and it went out not slightly wide, it was like 50 feet out.
On Monday, Williams did struggle with Canadian Eugenie Bouchard, but prevailed 4-6, 6-2, 6-2.
Williams first serve percentage was only 57% and she faced nine break points during the match. Stats that Serena knows she has to improve on.
"I got to the finals (here) once," explained Serena.
She also is getting familiar the Penn balls being used this week, not the normal balls she is used to.
"I'm not used to playing with these types of balls. Last week I think we were using Wilson, and I think the U.S. Open is a different ball. I'm not here to make excuses, it's my footwork."
Bouchard proved to be a tough opponent on this day in Cincinnati, and she is part of the new breed of young player that Serena and the other veteran players are dealing with.
"I think she has a good game," offered up Williams. "She has a good serve, she moves really well. She hits the ball really, really well. There's a reason she won Wimbledon juniors."
Next up for Serena is a matchup with Mona Barthel, a 23-year old from Germany.
But Serena has her eyes set on one prize, another U.S. Open title.
"I'm taking it year by year, week by week," adds Williams. "I plan on playing for a long, long time; we'll see how it goes.