Wimbledon 2019: Alexander Zverev and Stefanos Tsitsipas knocked out on day one

Sixth seed Alexander Zverev and seventh seed Stefanos Tsitsipas were surprise casualties at Wimbledon as Jiri Vesely and Thomas Fabbiano progressed.

German Zverev, 22, and Greek Tsitsipas, 20, have both been tipped as future Grand Slam champions but both went out in the space of half an hour.

Czech qualifier and world number 124 Vesely lost the first set but recovered to beat Zverev 4-6 6-3 6-2 7-5.

Italy's Fabbiano then claimed a 6-4 3-6 6-4 6-7 (6-8) 6-3 win over Tsitsipas.

Australian Open semi-finalist Tsitsipas saved two match points in the fourth-set tie-break but was scathing of his own performance.

"People expected things from me. I didn't deliver," said Tsitsipas.

"When you get so much support, so much energy, so much positivity from everyone, and just ruin everything by yourself, it's devastating."

The Greek questioned whether his generation had the same maturity as great champions Roger Federer, Rafael Nadal and Novak Djokovic.

"Rafa and Roger seemed very mature and professional in what they were doing, they had consistency from a young age. They always did well tournament by tournament without major drops or inconsistency.

"Something that we as the Next Gen players lack, including myself, is this consistency week by week."

Alexander Zverev was knocked out in the opening round for the first time at Wimbledon

'My confidence is below zero right now'

Zverev won the ATP Tour Finals title last November, beating Federer and Djokovic back-to-back, but has stalled this year, although he did reach the French Open quarter-finals - the furthest he has been in 18 Grand Slams.

"I didn't lose this match on tennis," he said. "It's just my confidence is below zero right now.

"I get down on myself a lot. Everything that happens outside the court affects you. The last two days, I would say, are very rough for me personally. I'm not going to get into details."

Vesely goes on to play Pablo Cuevas of Uruguay while world number 89 Fabbiano will face 40-year-old Ivo Karlovic.

The Croatian, the oldest man to play in the singles event since Ken Rosewall in 1975, beat Italian Andrea Arnaboldi 6-4 6-4 7-6 (7-4).

• Gauff, 15, stuns Venus Williams in huge upset

• GB's Edmund & Watson through to the second round

• Djokovic starts title defence with straight-set win

• World number two Osaka stunned by Putintseva

Anderson and Wawrinka ease through, Lopez continues form

Elsewhere, fourth seed Kevin Anderson won 6-3 6-4 6-2 against Frenchman Pierre-Hugues Herbert, who will partner Andy Murray in the men's doubles later this week.

Anderson only returned to action at Queen's after a three-month lay-off with an elbow injury, but eased past Herbert, who said afterwards he has been managing a thigh injury.

Canadian 19th seed Felix Auger-Aliassime became the first man born in the 2000s to win a Grand Slam main draw singles match with a four-set victory against his compatriot Vasek Pospisil.

The 18-year-old 19th seed Auger-Aliassime dropped the first set but recovered to win 5-7 6-2 6-4 6-3.

Another Canadian, 15th seed and 2016 finalist Milos Raonic, eased through in straight sets, beating India's Prajnesh Gunneswaran 7-6 (7-1) 6-4 6-2.

Switzerland's three-time Grand Slam champion Stan Wawrinka also eased through in straight sets, winning 6-3 6-2 6-2 against Belgium's Ruben Bemelmans, while Russian 10th seed Karen Khachanov beat South Korea's Kwon Soon-woo 7-6 (8-6) 6-4 4-6 7-5.

Queen's champion Feliciano Lopez, 37, continued his fine form on the grass with a 6-4 6-3 6-4 win over American Marcos Giron.

Ugo Humbert went through by virtue of his opponent retiring, with fellow Frenchman Gael Monfils, the 16th seed, pulling out with the score at 6-7 (6-8) 3-6 6-4 7-5 3-0.

• Watch video clips and relive text coverage of day one