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London - Rafael Nadal overcame two time warnings and Novak Djokovic shrugged off a knee problem to battle into the Wimbledon third round on Thursday but third seed and 2017 runner-up Marin Cilic crashed out.
World number one Nadal defeated Mikhail Kukushkin of Kazakhstan 6-4, 6-3, 6-4 and will next face Australian teenager Alex de Minaur.
Djokovic, the three-time champion, needed treatment on his left knee on Court Two but still had too much for Argentina's Horacio Zeballos, winning 6-1, 6-2, 6-3.
Djokovic has now made the third round for 10 consecutive years and will face either British 21st seed Kyle Edmund or US qualifier Bradley Klahn.
Cilic blew a two-set lead in his 3-6, 1-6, 6-4, 7-6 (7/3), 7-5 loss to Argentina's Guido Pella, ranked at 82.
When rain forced the tie to be postponed on Wednesday, Cilic was leading by two sets against an opponent who had never won a match at Wimbledon before this year.
But the Croatian collapsed once the match resumed on Court One on Thursday and Pella took full advantage to set up a third round clash with Mackenzie McDonald of the United States.
Cilic, the 2014 US Open champion, had been expected to mount a strong challenge for the Wimbledon title after winning the grass-court warm-up at Queen's Club two weeks ago.
But his defeat is good news for defending champion Roger Federer, who was on course to face Cilic in the semi-finals.
"Yesterday he was playing so good, hitting the ball so hard that I couldn't do anything," Pella said.
"So the rain helped me a lot. Today I played differently, tried to be more aggressive, he started to feel uncomfortable."
Cilic, the 2014 US Open champion, admitted it had been challenging to resume the match on Thursday.
"I was just not feeling as comfortable as yesterday with hitting. I was not as accurate," he said.
Nadal, the 2008 and 2010 champion, was tested by world number 77 Kukushkin who was made to pay for converting just two of 13 break points.
He was also hit with two time violations - one before the match had even started as he sat courtside.
"I didn't know but I don't see a clock here. I don't see a countdown. It's more difficult for me to understand what's going on," said 11-time French Open champion Nadal, who is chasing an 18th major.
For Djokovic, meanwhile, victory was his 60th at Wimbledon.
He hit 15 aces and 31 winners in a commanding win over 33-year-old Zeballos, who was a top 40 player in 2013 but was playing at Wimbledon ranked a lowly 126.
Former world number one Djokovic shrugged off a knee injury he suffered in the match.
"It's most likely a twitch in the muscle or something like this that has affected the knee a little bit. Hopefully it's nothing that will concern me," said Djokovic.
Three-time major winner Stan Wawrinka was unable to follow up his first round defeat of sixth seed Grigor Dimitrov when he lost 7-6 (9/7), 6-3, 7-6 (8/6) to Italian qualifier Thomas Fabbiano.
Fifth-seeded Juan Martin del Potro, who made the semi-finals in 2013, eased past 36-year-old Feliciano Lopez, a three-time quarter-finalist, who was playing in a record 66th consecutive major.
Del Potro's 6-4, 6-1, 6-2 win set-up a third round clash with France's Benoit Paire.
John Isner, the US ninth seed, saved two match points, fired 64 aces and 88 winners to defeat Belgian qualifier Ruben Bemelmans 6-1, 6-4, 6-7 (6/8), 6-7 (3/7), 7-5.
Nick Kyrgios, seeded 15, unleashed 42 winners to see off Robin Haase of the Netherlands 6-3, 6-4, 7-5.
Kyrgios next faces Japan's Kei Nishikori who put out Australian lucky loser Bernard Tomic 2-6, 6-3, 7-6 (9/7), 7-5.
Women's top seed and French Open champion Simona Halep reached the third round with a 7-5, 6-0 win over China's Zheng Saisai and next plays Hsieh Su-Wei of Taiwan
The Romanian raced away with the 10 last games to beat the 126-ranked Zheng.
Later Thursday, German fourth seed Alexander Zverev takes on Taylor Fritz, the world number 68, who is bidding to reach the third round of a Slam for the first time.
Defending women's champion Garbine Muguruza faces Alison van Uytvanck, the Belgian world number 47, who has never defeated a top 10 player.
Wimbledon results on Thursday, the fourth day of the 2018 championships (x denotes seeded player):
Men
Second round
Philipp Kohlschreiber (GER x25) bt Gilles Muller (LUX) 7-6 (8/6), 7-6 (7/4), 7-6 (7/3)
Kevin Anderson (RSA x8) bt Andreas Seppi (ITA) 6-3, 6-7 (5/7), 6-3, 6-4
Guido Pella (ARG) bt Marin Cilic (CRO x3) 3-6, 1-6, 6-4, 7-6 (7/3), 7-5
John Isner (USA x9) bt Ruben Bemelmans (BEL) 6-1, 6-4, 6-7 (6/8), 6-7 (3/7), 7-5
Stefanos Tsitsipas (GRE x31) bt Jared Donaldson (USA) 6-3, 6-2, 3-6, 4-6, 6-3
Thomas Fabbiano (ITA) bt Stan Wawrinka (SUI) 7-6 (9/7), 6-3, 7-6 (8/6)
Karen Khachanov (RUS) bt Marcos Baghdatis (CYP) 6-3, 6-4, 3-6, 6-7 (4/7), 7-5
Frances Tiafoe (USA) bt Julien Benneteau (FRA) 4-6, 6-3, 6-4, 6-2
Kyle Edmund (GBR x21) bt Bradley Klahn (USA) 6-4, 7-6 (7/0), 6-2
Novak Djokovic (SRB x12) bt Horacio Zeballos (ARG) 6-1, 6-2, 6-3
Nick Kyrgios (AUS x15) bt Robin Haase (NED) 6-3, 6-4, 7-5
Kei Nishikori (JPN x24) bt Bernard Tomic (AUS) 2-6, 6-3, 7-6 (9/7), 7-5
Ernests Gulbis (LAT) bt Damir Džumhur (BIH x27) 2-6, 6-4, 6-3, 1-6, 6-3
Juan Martín Del Potro (ARG x5) bt Feliciano Lopez (ESP) 6-4, 6-1, 6-2
Benoît Paire (FRA) bt Denis Shapovalov (CAN x26) 0-6, 6-2, 6-4, 7-6 (7/3)
Gilles Simon (FRA) bt Matteo Berrettini (ITA) 6-3, 7-6 (7/4), 6-2
Matthew Ebden (AUS) bt Stéphane Robert (FRA) 6-3, 7-6 (7/5), 4-6, 6-1
Jirí Veselý (CZE) bt Diego Schwartzman (ARG x14) 6-3, 6-4, 7-6 (7/3)
Fabio Fognini (ITA x19) bt Simone Bolelli (ITA) 6-3, 6-4, 6-1
Alex De Minaur (AUS) bt Pierre-Hugues Herbert (FRA) 6-2, 6-7 (8/10), 7-5, 6-3
Rafael Nadal (ESP x2) bt Mikhail Kukushkin (KAZ) 6-4, 6-3, 6-4
Suspended for darkness:
Taylor Fritz (USA) leads Alexander Zverev (GER x4) 4-6, 7-5, 7-6 (7/0)
Women
Second round
Simona Halep (ROM x1) bt Zheng Saisai (CHN) 7-5, 6-0
Hsieh Su-Wei (TPE) bt Lara Arruabarrena (ESP) 6-3, 6-3
Dominika Cibulkova (SVK) bt Johanna Konta (GBR x22) 6-3, 6-4
Elise Mertens (BEL x15) bt Sachia Vickery (USA) 6-1, 6-3
Jelena Ostapenko (LAT x12) bt Kirsten Flipkens (BEL) 6-1, 6-3
Vitalia Diatchenko (RUS) bt Sofia Kenin (USA) 6-4, 6-1
Daria Gavrilova (AUS x26) bt Samantha Stosur (AUS) 6-4, 6-1
Aliaksandra Sasnovich (BLR) bt Taylor Townsend (USA) 6-0, 6-4
Alison Van Uytvanck (BEL) bt Garbiñe Muguruza (ESP x3) 5-7, 6-2, 6-1
Anett Kontaveit (EST x28) bt Jennifer Brady (USA) 6-2, 7-6 (7/4)
Ashleigh Barty (AUS x17) bt Eugenie Bouchard (CAN) 6-4, 7-5
Daria Kasatkina (RUS x14) bt Yulia Putintseva (KAZ) 6-2, 6-3
Angelique Kerber (GER x11) bt Claire Liu (USA) 3-6, 6-2, 6-4
Naomi Osaka (JPN x18) bt Katie Boulter (GBR) 6-3, 6-4
Carla Suárez (ESP x27) bt Sara Sorribes (ESP) 6-4, 6-1
Belinda Bencic (SUI) bt Alison Riske (USA) 1-6, 7-6 (12/10), 6-2
Barbora Strycova (CZE x23) bt Lesia Tsurenko (UKR) 6-1, 6-4
Katerina Siniakova (CZE) bt Ons Jabeur (TUN) 5-7, 6-4, 9-7
