Caroline Wozniacki's 2016 Summer Olympics dream came to an end on Monday, as Petra Kvitova defeated the former world No. 1, 6-2, 6-4, in the round of 32 of the women's tennis tournament in Rio de Janeiro.
The Danish star continued her poor 2016 campaign with another underwhelming outing, putting up little resistance on her way out of the Games.
Elsewhere, Monica Puig booked her spot in the next round, dropping just five games in total to Anastasia Pavlyuchenkova, as she won 6-3, 6-2. Angelique Kerber stayed right on track, taking care of Eugenie Bouchard, and Lucie Safarova was forced to retire against Kirsten Flipkens.
Here's a look at Monday's results:
|Monica Puig (PUR) bt. Anastasia Pavlyuchenkova (RUS) ||6-3, 6-2|
|Petra Kvitova (CZE) bt. Caroline Wozniacki (DEN)||6-2, 6-4|
|Carla Suarez Navarro (ESP) bt. Ana Konjuh (CRO)||7-6 (5), 6-3|
|Svetlana Kuznetsova (RUS)  bt. Monica Niculescu (ROU)||Walkover|
|Angelique Kerber (GER)  bt. Eugenie Bouchard (CAN)||6-4, 6-2|
|Madison Keys (USA)  bt. Kristina Mladenovic (FRA)||7-5, 6-7 (4), 7-6 (5)|
|Johanna Konta (GBR) bt. Caroline Garcia (FRA)||6-2, 6-3|
|Elina Svitolina (UKR) bt. Heather Watson (GBR)||6-3, 1-6, 6-3|
|Ekaterina Makarova (RUS) bt. Anna Karolina Schmiedlova (SVK)||3-6, 6-4, 6-2|
|Daria Kasatkina (RUS) bt. Saisai Zheng (CHN)||6-1, 6-4|
|Kirsten Flipkens (BEL) bt. Lucie Safarova (CZE)||6-2, 0-0*|
|Samantha Stosur (AUS)  bt. Misaki Doi (JPN)||6-3, 6-4|
|Garbine Muguruza (ESP) bt. Nao Hibino (JPN)||6-1, 6-1|
|Laura Siegemund (GER) bt. Shuai Zhang (CHN)||6-2, 6-4|
|Sara Errani (ITA) bt. Barbora Strycova (CZE)||6-2, 6-2|
|Serena Williams (USA)  bt. Alize Cornet||7-6(5), 6-2|
Reigning gold medalist Serena Williams received a stern test from Alize Cornet and advanced in straight sets, 7-6(5), 6-2.
Cornet played excellent defensive tennis in the opening set, with her speed and recovery giving the tournament's top seed plenty of fits. And as Cornet continued to stay alive deep into points, Williams became visibly frustrated.
At one point, she slammed her racket to the court in disgust. NBC Olympics provided a look at the aftermath:
Williams survived two set points to win the opening set in a tiebreaker. Cornet was unable to maintain her level of performance from the first set and put up little resistance in the second.
Kvitova has been in fine form of late and wasted little time finding a rhythm against Wozniacki, taking the first four games of their match with excellent baseline tennis. The former world No. 2 flashed her tremendous power in the rallies, and Wozniacki simply couldn't keep up.
The Record's Jose Morgado was impressed:
Kvitova's serve was a little shaky, however, and Wozniacki pulled a break back to bring some excitement to the first set, but her opponent responded immediately and served for the set after just 40 minutes.
Just a few minutes later, the first set was over, and Morgado was still blown away:
Wozniacki took the opening game of the second set, but her game soon fell apart again, with Kvitova grabbing a break in the third game. Wozniacki fought back to a 5-4 score before Kvitova slammed the door on her comeback attempt.
The loss is yet another setback for Wozniacki, who has struggled with injuries in 2016 and has tumbled out of the top 40 completely.
Puig cruised to the round of 16 with an easy win over Pavlyuchenkova, becoming the first player to book passage to the next round. Svetlana Kuznetsova earned a free pass into the third round as a result of Monica Niculescu withdrawing from the competition.
Kerber bounced back from a rough start to beat Bouchard, who ran out to a quick 4-1 lead in the first set before her opponent found her groove. Per Jon Wertheim of Sports Illustrated, she finished strongly:
The German star wasn't at her best in the first round and showed more signs of weakness against Bouchard, but her second-set showing indicates she's starting to find her form. If she does, she's a strong candidate to medal in this year's event.
The British stars had a bit of a mixed day, as Heather Watson lost in three sets to Elina Svitolina and Johanna Konta shocked Caroline Garcia.
But there was an even bigger upset in store, as Flipkens continued her Cinderella run with a win over Safarova. The Belgian won the first set 6-2 and watched as her opponent failed to come out for the second set. It's unclear whether Safarova will still be active in the doubles tournament.
Garbine Muguruza wasted little time getting past Japan's Nao Hibino, as the Spanish star dropped just two games. The Roland Garros winner is another strong contender for the gold medal.