Wimbledon 2015 Results: Winners, Scores, Stats from Saturday's Singles Bracket

A day after Serena Williams barely survived an upset bid at Wimbledon, No. 2 seed and defending champion Petra Kvitova was not as fortunate.

Kvitova dropped a 3-6, 7-5, 6-4 decision to 28th-seeded Jelena Jankovic in the biggest upset of the day at the All England Tennis Club.

Kvitova had been a destructive in winning her first two matches easily, but Jankovic warmed to the task after dropping the first set. The WTA noted Jankovic's win and its significance:

"

.@Jelena_Jankovic upsets defending #Wimbledon champ Kvitova 36 75 64! 1st Top 10 win of 2015-> http://t.co/uTrk0KcI1G pic.twitter.com/IiF0pQOclp

— WTA (@WTA) July 4, 2015"

Jankovic fell behind 4-2 in the second set before she pulled off her tremendous rally. Jankovic, 30, has never advanced past the quarterfinal round of the tournament before.

Jankovic was able to stay with her game and avoid mistakes. She made just 11 unforced errors in the three sets, while Kvitova had 21.

"I'm overwhelmed. I'm so excited. My heart is still pumping," Jankovic said after the match (h/t WTA.com). "Playing on grass is very difficult for me—it doesn't come naturally. But playing on Centre Court against the defending champion was just unbelievable. I'm really really happy to win this match!"

Round	Winning Player	Losing Player	Score
3	Monica Niculescu	Kristyna Pliskova	6-3, 7-5
3	Garbine Muguruza (20)	Angelique Kerber (10)	7-6 (14-12), 1-6, 6-2
3	Caroline Wozniacki (5)	Camila Giorgi (31)	6-2, 6-2
3	Agnieszka Radwanska (13)	Casey Dellacqua	6-1, 6-4
3	Timea Bacsinszky (15)	Sabine Lisicki (18)	6-3, 6-2
3	Madison Keys (21)	Tatjana Maria	6-4, 6-4
3	Jelena Jankovic (28)	Petra Kvitova	3-6, 7-5, 6-4
3	Olga Govortsova	Magdalena Rybarikova	7-6 (7-4), 6-3
3	Viktor Troicki (22)	Dustin Brown	6-4, 7-6 (7-3), 4-6, 6-3
3	Roger Federer (2)	Sam Groth	6-4, 6-4, 6-7 (5-7), 6-2
3	Ivo Karlovic (23)	Jo-Wilfried Tsonga	7-6 (7-3), 4-6, 7-6 (7-2), 7-6 (11-9)
3	Tomas Berdych (6)	Pablo Andjuar	4-6, 6-0, 6-3, 7-6 (7-3)
3	Vasek Pospisil	James Ward	6-4, 3-6, 2-6, 6-3, 8-6
3	Andy Murray (3)	Andreas Seppi (25)	6-2, 6-2, 1-6, 6-1
3	Roberto Bautista Agut (20)	Nikoloz Basilashvili	7-6 (7-4), 6-0, 6-1
3	Gilles Simon (12)	Gael Monfils (18)	3-6, 6-3, 7-6 (8-6), 2-6, 6-2

Tim Ireland/Associated Press

On the men's side, Roger Federer lost his first set of the fortnight, but he had little trouble in defeating Sam Groth 6-4, 6-4, 6-7 (5-7), 6-2.

The second-seeded Federer is playing for his eighth championship at Wimbledon. While the hard-serving Groth had 21 aces to Federer's four, Federer was extremely effective when he got his first serve in. He won 60 of 67 points (90 percent) when he was able to dictate the pace by putting his first serve in play. Conversely, Groth won 73 percent of his points when he was able to get his first serve in. The ATP World Tour highlighted Federer's win and noted his upcoming match against Bautista Agut:

"

.@rogerfederer to play @BautistaAgut at #Wimbledon after 4-set win over @SamGrothTennis http://t.co/QYx0yLTzNi #atp pic.twitter.com/vIMzks6TW9

— ATP World Tour (@ATPWorldTour) July 4, 2015"

Federer continued to play sharp, nearly error-free tennis. He made just eight unforced errors in the match, while Groth was hurt by his 19 unforced mistakes.

Federer's ability to return Groth's powerful serve—which topped out at 147 miles per hour—allowed him to remain in control of the match. He explained to Jim White of The Telegraph how he was able to do that. 

"Really, I think it’s about keeping a short backswing on the return, trying to see it,” Federer said.

Alastair Grant/Associated Press

No. 3 seed Andy Murray also needed four sets to get past Andreas Seppi of Italy 6-2, 6-2, 1-6, 6-1 and move on to the tournament's second week.

Murray started the match with his blazing serve and strong return dominating, but he lost all of his momentum in the third set after Seppi called for a timeout and the trainer was able to help get him on track.

Instead of Murray making all the big shots, Seppi executed precisely after that visit from the trainer. When Seppi won the first game of the fourth set, Murray called a timeout and asked for the trainer to attend to his shoulder problems.

That move seemed to energize Murray, who swept through the final six games of the match. "I had a lot of energy at the end, and I was able to aggressively go after my serve," Murray told the BBC after the match (via ESPN broadcast).

Murray's aggressiveness was underscored by the 32 winners he hit throughout the match. Seppi was able to convert 22 winners.

Seppi also had a problem with unforced errors, as he had 39 of them in the match, while Murray was charged with 26.

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 All stats courtesy of Wimbledon.com