Serena Williams overcame early struggles, sweeping past countrywoman Kristie Ahn 7-6 (2), 6-0 to reach the French Open second round.
Williams, again eyeing a record-tying 24th Grand Slam singles title, started out like somebody who went 16 months between clay-court matches. She needed 74 minutes to take the first set from the 102nd-ranked Ahn, recovering twice after having her serve broken.
She dominated the second set in 27 minutes, advancing to play Bulgarian and fellow mom Tsvetana Pironkova, a rematch of their three-set U.S. Open quarterfinal three weeks ago.
Williams, in long sleeves and tights, had 15 winners to 28 unforced errors in the first set in cloudy, sub-60-degree weather on Monday.