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The Latest: Kvitova in trouble at French Open

  • Montenegro's Danka Kovinic returns the ball to Petra Kvitova of the Czech Republic during their first round match of the French Tennis Open at the Roland Garros stadium, Sunday, May 22, 2016 in Paris.  (AP Photo/Michel Euler)

    Montenegro's Danka Kovinic returns the ball to Petra Kvitova of the Czech Republic during their first round match of the French Tennis Open at the Roland Garros stadium, Sunday, May 22, 2016 in Paris. (AP Photo/Michel Euler)  (The Associated Press)

  • Petra Kvitova of the Czech Republic returns the ball to Montenegro's Danka Kovinic during their first round match of the French Tennis Open at the Roland Garros stadium, Sunday, May 22, 2016 in Paris.  (AP Photo/Michel Euler)

    Petra Kvitova of the Czech Republic returns the ball to Montenegro's Danka Kovinic during their first round match of the French Tennis Open at the Roland Garros stadium, Sunday, May 22, 2016 in Paris. (AP Photo/Michel Euler)  (The Associated Press)

  • People stroll under umbrellas in the alleys of the Roland Garros stadium before the first round matches of the French Open tennis tournament, Sunday, May 22, 2016 in Paris.  (AP Photo/Alastair Grant)

    People stroll under umbrellas in the alleys of the Roland Garros stadium before the first round matches of the French Open tennis tournament, Sunday, May 22, 2016 in Paris. (AP Photo/Alastair Grant)  (The Associated Press)

The Latest on the French Open (all times local):

12:50 a.m.

Two-time Wimbledon champion Petra Kvitova is having trouble on Court Philippe Chatrier.

The 10th-seeded Czech looked in control after breaking Danka Kovinic twice to win the first set 6-2 but dropped the second 6-4.

Kovinic has never gone beyond the second round at any Grand Slam tournament while Kvitova's best result at the French Open is a semifinalist spot back in 2012.

Earlier, 24th-seeded Anastasia Pavlyuchenkova became the first player to advance to the second round with a 6-2, 6-0 win over Sara Sorribes Tormo.

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11:35 a.m.

Despite rain much of the morning, the French Open has started.

The forecast calls for showers on Sunday, but a break in the weather allowed two-time Wimbledon champion Petra Kvitova onto Court Philippe Chatrier to face 59th-ranked Danka Kovinic of Montenegro in a first-round match.

Other players scheduled to play on Day 1 of the clay-court tournament include 2014 U.S. Open runner-up Kei Nishikori, eighth-seeded Milos Raonic, and 2015 Wimbledon finalist Garbine Muguruza.

The French Open is the only Grand Slam tournament that begins on a Sunday.

About six months after the deadly attacks in Paris, heightened security at Roland Garros was noticeable, including extra bag checks and patdowns that led to longer-than-usual waits at the entrance gates.