London - Nick Kyrgios revealed he knew he wasn't fit enough to play Wimbledon after being forced to retire from his first round match against Pierre-Hugues Herbert on Monday.
Kyrgios has been struggled to recover from the left hip injury that forced him to pull out of Queen's Club last month and he was advised by a doctor not to compete at Wimbledon.
But the 22-year-old had reached at least the fourth round in all three of his previous Wimbledon appearances and wanted to give it a shot at his favourite Grand Slam.
After losing in the second round at both the Australian and French Opens this year, Kyrgios's miserable 2017 continued as the world number 20 lost the first two sets 6-3, 6-4 against Herbert before deciding to call it quits due to the nagging injury.
"I kind of knew I was in trouble. I have been feeling my hip ever since I fell over at Queen's," Kyrgios said.
"Never got it right. I was doing everything I could to help it, but just not enough time. Yeah, I mean, I just wasn't 100 percent.
"I spoke to the doctor before the tournament started. He was leaning towards me not even playing.
"It's my favourite tournament. I do well here every year. So it's tough for me to go out there and pull out. It's not the easiest thing for me to do."
Kyrgios, then ranked 144th, burst onto the scene at Wimbledon in 2014 when he defeated then world number one Rafael Nadal en route to the quarter-finals.
But from the moment he stepped onto Court Three wearing long white leggings under his shorts, Kyrgios didn't look comfortable.
"I thought I could win. Obviously probably not against him, but some opponents if I played them today, I probably still could have won," he said.
"I could feel the hip a lot. It was hindering my performance a lot."
Kyrgios would prefer not to undergo surgery, but is likely to have a scan this week to determine whether the hip has been aggravated by his decision to play Wimbledon.
"Probably get an MRI tomorrow. Hopefully get an injection or something, do rehab, and get healthy," Kyrgios said.
"I don't think anyone wants to go down the surgery route. I would do everything possible to avoid it.
"I mean, I'm obviously a little bit scared. But I don't think I need it at the moment."
Herbert will face French compatriot Benoit Paire for a place in the third round.
Wimbledon results on Monday, the first day of the 2017 championships at the All England Club (x denotes seeding):
Dustin Brown (GER) bt Joao Sousa (POR) 3-6, 7-6 (7/5), 6-4, 6-4
Pierre-Hugues Herbert (FRA) bt Nick Kyrgios (AUS x20) 6-3, 6-4 -- retired
Jo-Wilfried Tsonga (FRA x12) bt Cameron Norrie (GBR) 6-3, 6-2, 6-2
Simone Bolelli (ITA) bt Lu Yen-Hsun (TPE) 6-3, 1-6, 6-3, 6-4
Sam Querrey (USA x24) bt Thomas Fabbiano (ITA) 7-6 (7/5), 7-5, 6-2
Wang Qiang (CHN) bt Kai-Chen Chang (TPE) 6-3, 6-4
Madison Keys (USA x17) bt Nao Hibino (JPN) 6-4, 6-2
Aryna Sabalenka (BLR) bt Irina Khromacheva (RUS) 6-3, 6-4
Beatriz Haddad Maia (BRA) bt Laura Robson (GBR) 6-4, 6-2