London: Two-time former champion Petra Kvitova slumped out of Wimbledon in the first round on Tuesday, beaten by inspired world No. 50 Aliaksandra Sasnovich of Belarus 6-4, 4-6, 6-0.

Eighth seed Kvitova, who withdrew from the Eastbourne tournament last week with a hamstring injury, appeared to be moving well but looked pale and drawn particularly in the first set. Kvitova, 28, has worked hard this year, winning five titles. The Czech, Wimbledon champion in 2011 and 2014, won back to back tournaments in Prague and Madrid, and successfully defended her title on grass in Birmingham last month.Sasnovich, 24, kept her cool throughout the two hour 14 minute match.

French Open runner-up Dominic Thiem's Wimbledon adventure ended abruptly in the first round  as he retired with an apparent back injury while trailing Cypriot Marcos Baghdatis.

The Austrian was sprawled on his stomach on Court Two as he received a deep-tissue back massage from the trainer before the start of the third set.The trainer then rolled the seventh seed on to his back to manipulate Thiem's shoulders but the intervention failed to have the desired affect as he called it quits after losing the next two games. Baghdatis was leading 6-4 7-5 2-0 when Thiem retired.

World No. 1 Rafael Nadal breezed into the second round with a 6-3, 6-3, 6-2 win over Israel's Dudi Sela as the Spaniard returned to action for the first time since claiming his 11th French Open title.

Dominic Thiem
Dominic Thiem in action during the first round match against Cyprus' Marcos Baghdatis. Reuters

Nadal, the Wimbledon champion in 2008 and 2010, also managed to avoid falling victim to a player ranked outside the world top 100 for what would have been the fifth time in his last six visits to the All England Club.

"It's great always to play here in Wimbledon, especially on Centre Court," said Nadal after seeing off world No. 127 Sela.

"I'm just happy to be through of course and yes, this match gives me positive feelings. There's still room to improve but after a while without playing on grass, of course it's very important to start with a straight sets victory."

Nadal, the 17-time major winner, has not got past the fourth round since finishing runner-up to Novak Djokovic in 2011.

Argentine fifth seed Juan Martin del Potro made it nine first round wins in nine appearances at the tournament, breezing past Germany's Peter Gojowczyk 6-3, 6-4, 6-3.

 Lopez  sets record

Del Potro, who made the semifinals in 2013, next faces Feliciano Lopez of Spain who set a record of playing 66 consecutive Grand Slams when he eased past Federico Delbonis of Argentina 6-3, 6-4, 6-2.

Left-handed Lopez made his debut at the majors at the 2001 French Open.

The 36-year-old broke the record for straight Slams which was previously held by Roger Federer.

"When I was about to break the record, I thought, wow, I'm going to beat Federer at something!" joked the 70th-ranked Lopez who has lost all 13 matches he has played against Federer in his career.

German fourth seed Alexander Zverev eased past world No. 748 James Duckworth of Australia 7-5, 6-2, 6-0.

Zverev, who made the last 16 in 2017, goes on to face Taylor Fritz of the United States.

Spain's Garbine Muguruza opened her title defence with a 6-2, 7-5 win over British wild card Naomi Broady.

Muguruza is bidding to reach her third Wimbledon final after winning last year's title match against Venus Williams and losing the 2015 showpiece against Serena Williams.

The two-time Grand Slam champion needed 88 minutes to see off world number 138 Broady on Centre Court.

"I'm back, it's always good, I'm thinking to win and actually enjoy this time more," Muguruza said.

Third seed Muguruza, 24, next faces Belgium's Alison Van Uytvanck.

Australia's Nick Kyrgios, who famously stunned Nadal at the tournament in 2014, marked his 50th match at the majors with a 7-6 (7/3), 7-6 (7/4), 6-7 (5/7), 6-3 win over Denis Istomin of Uzbekistan.

Kyrgios, seeded 15, hammered down 42 aces and unleashed 78 winners.

Eugenie Bouchard, the runner-up in 2014 before her career went into a tailspin, reached the second round with a 6-0, 4-6, 6-3 victory over British wild card Gabriella Taylor.

Bouchard, now ranked 188 in the world, will face fellow former Wimbledon junior champion Ashleigh Barty for a spot in the last 32.

Belgium's David Goffin, the 10th seed, slumped to a 6-4, 6-3, 6-4 loss to Australia's Matthew Ebden, playing the tournament for the first time in three years.

Elsewhere, Angelique Kerber, a former US Open and Australian Open champion, saw off fellow former Wimbledon runner-up Vera Zvonareva 7-5, 6-3.

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